15081681 has 16 divisors (see below), whose sum is σ = 20913984. Its totient is φ = 9658944.

The previous prime is 15081667. The next prime is 15081697. The reversal of 15081681 is 18618051.

It is a happy number.

It is not a de Polignac number, because 15081681 - 2¹⁰ = 15080657 is a prime.

It is a super-2 number, since 2×15081681² = 454914203571522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15081641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8395 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (1307124).

Almost surely, 2^15081681 is an apocalyptic number.

It is an amenable number.

15081681 is a deficient number, since it is larger than the sum of its proper divisors (5832303).

15081681 is a wasteful number, since it uses less digits than its factorization.

15081681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 15081681 is about 3883.5140015198. The cubic root of 15081681 is about 247.0680477115.

The spelling of 15081681 in words is "fifteen million, eighty-one thousand, six hundred eighty-one".