15972113 has 2 divisors, whose sum is σ = 15972114. Its totient is φ = 15972112.

The previous prime is 15972091. The next prime is 15972119. The reversal of 15972113 is 31127951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9535744 + 6436369 = 3088^2 + 2537^2 .

It is an emirp because it is prime and its reverse (31127951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15972113 - 2¹⁰ = 15971089 is a prime.

It is not a weakly prime, because it can be changed into another prime (15972119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986056 + 7986057.

It is an arithmetic number, because the mean of its divisors is an integer number (7986057).

Almost surely, 2^15972113 is an apocalyptic number.

It is an amenable number.

15972113 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972113 is an equidigital number, since it uses as much as digits as its factorization.

15972113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 15972113 is about 3996.5126047593. The cubic root of 15972113 is about 251.8377272663.

The spelling of 15972113 in words is "fifteen million, nine hundred seventy-two thousand, one hundred thirteen".