15992381 has 2 divisors, whose sum is σ = 15992382. Its totient is φ = 15992380.

The previous prime is 15992341. The next prime is 15992387. The reversal of 15992381 is 18329951.

15992381 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., 15405625 + 586756 = 3925^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 15992381 - 2¹⁰ = 15991357 is a prime.

It is a super-2 number, since 2×15992381² = 511512500098322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15992387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7996190 + 7996191.

It is an arithmetic number, because the mean of its divisors is an integer number (7996191).

Almost surely, 2^15992381 is an apocalyptic number.

It is an amenable number.

15992381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15992381 is an equidigital number, since it uses as much as digits as its factorization.

15992381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 38.

The square root of 15992381 is about 3999.0475115957. The cubic root of 15992381 is about 251.9442063849.

The spelling of 15992381 in words is "fifteen million, nine hundred ninety-two thousand, three hundred eighty-one".