15331969 has 2 divisors, whose sum is σ = 15331970. Its totient is φ = 15331968.

The previous prime is 15331957. The next prime is 15331973. The reversal of 15331969 is 96913351.

15331969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15249025 + 82944 = 3905^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 15331969 - 2⁵ = 15331937 is a prime.

It is a super-2 number, since 2×15331969² = 470138546833922, which contains 22 as substring.

It is equal to p₉₉₀₇₈₄ and since 15331969 and 990784 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (15331369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7665984 + 7665985.

It is an arithmetic number, because the mean of its divisors is an integer number (7665985).

Almost surely, 2^15331969 is an apocalyptic number.

It is an amenable number.

15331969 is a deficient number, since it is larger than the sum of its proper divisors (1).

15331969 is an equidigital number, since it uses as much as digits as its factorization.

15331969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 37.

The square root of 15331969 is about 3915.6058279658. The cubic root of 15331969 is about 248.4272951440.

The spelling of 15331969 in words is "fifteen million, three hundred thirty-one thousand, nine hundred sixty-nine".