15091681 has 16 divisors (see below), whose sum is σ = 17475840. Its totient is φ = 12888720.

The previous prime is 15091679. The next prime is 15091693. The reversal of 15091681 is 18619051.

It is a cyclic number.

It is not a de Polignac number, because 15091681 - 2¹ = 15091679 is a prime.

It is a super-2 number, since 2×15091681² = 455517670811522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15091621) 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 15 ways as a sum of consecutive naturals, for example, 33846 + ... + 34288.

It is an arithmetic number, because the mean of its divisors is an integer number (1092240).

Almost surely, 2^15091681 is an apocalyptic number.

15091681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15091681 is a deficient number, since it is larger than the sum of its proper divisors (2384159).

15091681 is a wasteful number, since it uses less digits than its factorization.

15091681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 15091681 is about 3884.8012819191. The cubic root of 15091681 is about 247.1226423024.

The spelling of 15091681 in words is "fifteen million, ninety-one thousand, six hundred eighty-one".