15938491 has 2 divisors, whose sum is σ = 15938492. Its totient is φ = 15938490.

The previous prime is 15938459. The next prime is 15938501. The reversal of 15938491 is 19483951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15938491 - 2⁵ = 15938459 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15938431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7969245 + 7969246.

It is an arithmetic number, because the mean of its divisors is an integer number (7969246).

Almost surely, 2^15938491 is an apocalyptic number.

15938491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15938491 is an equidigital number, since it uses as much as digits as its factorization.

15938491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 15938491 is about 3992.3039713930. The cubic root of 15938491 is about 251.6608932982.

The spelling of 15938491 in words is "fifteen million, nine hundred thirty-eight thousand, four hundred ninety-one".