15551081 has 12 divisors (see below), whose sum is σ = 19482372. Its totient is φ = 12303648.

The previous prime is 15551033. The next prime is 15551083. The reversal of 15551081 is 18015551.

It can be written as a sum of positive squares in 2 ways, for example, as 2706025 + 12845056 = 1645^2 + 3584^2 .

It is not a de Polignac number, because 15551081 - 2⁶ = 15551017 is a prime.

It is a super-2 number, since 2×15551081² = 483672240537122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15551081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551083) 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 11 ways as a sum of consecutive naturals, for example, 11570 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (1623531).

Almost surely, 2^15551081 is an apocalyptic number.

It is an amenable number.

15551081 is a deficient number, since it is larger than the sum of its proper divisors (3931291).

15551081 is a wasteful number, since it uses less digits than its factorization.

15551081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24440 (or 24433 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 15551081 is about 3943.4858944847. The cubic root of 15551081 is about 249.6051420103.

The spelling of 15551081 in words is "fifteen million, five hundred fifty-one thousand, eighty-one".