15081661 has 12 divisors (see below), whose sum is σ = 17614368. Its totient is φ = 12875352.

The previous prime is 15081659. The next prime is 15081667. The reversal of 15081661 is 16618051.

15081661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15081661 - 2¹ = 15081659 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 (15081667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16560 + ... + 17446.

It is an arithmetic number, because the mean of its divisors is an integer number (1467864).

Almost surely, 2^15081661 is an apocalyptic number.

It is an amenable number.

15081661 is a deficient number, since it is larger than the sum of its proper divisors (2532707).

15081661 is an equidigital number, since it uses as much as digits as its factorization.

15081661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 15081661 is about 3883.5114265314. The cubic root of 15081661 is about 247.0679384981.

The spelling of 15081661 in words is "fifteen million, eighty-one thousand, six hundred sixty-one".