1551312 has 140 divisors (see below), whose sum is σ = 5421280. Its totient is φ = 419904.

The previous prime is 1551289. The next prime is 1551343. The reversal of 1551312 is 2131551.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 81639 + ... + 81657.

2^1551312 is an apocalyptic number.

1551312 is a gapful number since it is divisible by the number (12) 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 1551312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2710640).

1551312 is an abundant number, since it is smaller than the sum of its proper divisors (3869968).

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

1551312 is an equidigital number, since it uses as much as digits as its factorization.

1551312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 31 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 1551312 is about 1245.5167602244. The cubic root of 1551312 is about 115.7620966448.

Adding to 1551312 its reverse (2131551), we get a palindrome (3682863).

The spelling of 1551312 in words is "one million, five hundred fifty-one thousand, three hundred twelve".