1551000 has 128 divisors (see below), whose sum is σ = 5391360. Its totient is φ = 368000.

The previous prime is 1550999. The next prime is 1551001. The reversal of 1551000 is 1551.

It is an interprime number because it is at equal distance from previous prime (1550999) and next prime (1551001).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32977 + ... + 33023.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2^1551000 is an apocalyptic number.

1551000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2695680).

1551000 is an abundant number, since it is smaller than the sum of its proper divisors (3840360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551000 is a wasteful number, since it uses less digits than its factorization.

1551000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 1551000 is about 1245.3915047085. The cubic root of 1551000 is about 115.7543354303.

Adding to 1551000 its reverse (1551), we get a palindrome (1552551).

1551000 divided by its reverse (1551) gives a cube (1000 = 10³).

It can be divided in two parts, 15 and 51000, that added together give a palindrome (51015).

The spelling of 1551000 in words is "one million, five hundred fifty-one thousand".