1551005 has 8 divisors (see below), whose sum is σ = 1942272. Its totient is φ = 1186768.

The previous prime is 1551001. The next prime is 1551013. The reversal of 1551005 is 5001551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1551005 - 2² = 1551001 is a prime.

It is a Duffinian number.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6629 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (242784).

2^1551005 is an apocalyptic number.

It is an amenable number.

1551005 is a deficient number, since it is larger than the sum of its proper divisors (391267).

1551005 is a wasteful number, since it uses less digits than its factorization.

1551005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13515.

The product of its (nonzero) digits is 125, while the sum is 17.

The square root of 1551005 is about 1245.3935121077. The cubic root of 1551005 is about 115.7544598169.

Adding to 1551005 its reverse (5001551), we get a palindrome (6552556).

The spelling of 1551005 in words is "one million, five hundred fifty-one thousand, five".