15551065 has 4 divisors (see below), whose sum is σ = 18661284. Its totient is φ = 12440848.

The previous prime is 15551033. The next prime is 15551083. The reversal of 15551065 is 56015551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4897369 + 10653696 = 2213^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 15551065 - 2⁵ = 15551033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1555102 + ... + 1555111.

It is an arithmetic number, because the mean of its divisors is an integer number (4665321).

Almost surely, 2^15551065 is an apocalyptic number.

It is an amenable number.

15551065 is a deficient number, since it is larger than the sum of its proper divisors (3110219).

15551065 is an equidigital number, since it uses as much as digits as its factorization.

15551065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110218.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 15551065 is about 3943.4838658222. The cubic root of 15551065 is about 249.6050564068.

The spelling of 15551065 in words is "fifteen million, five hundred fifty-one thousand, sixty-five".