15988081 has 2 divisors, whose sum is σ = 15988082. Its totient is φ = 15988080.

The previous prime is 15988069. The next prime is 15988087. The reversal of 15988081 is 18088951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9511056 + 6477025 = 3084^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 15988081 - 2⁷ = 15987953 is a prime.

It is a super-2 number, since 2×15988081² = 511237468125122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15988087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7994040 + 7994041.

It is an arithmetic number, because the mean of its divisors is an integer number (7994041).

Almost surely, 2^15988081 is an apocalyptic number.

It is an amenable number.

15988081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15988081 is an equidigital number, since it uses as much as digits as its factorization.

15988081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 15988081 is about 3998.5098474307. The cubic root of 15988081 is about 251.9216236063.

The spelling of 15988081 in words is "fifteen million, nine hundred eighty-eight thousand, eighty-one".