15938591 has 2 divisors, whose sum is σ = 15938592. Its totient is φ = 15938590.

The previous prime is 15938581. The next prime is 15938599. The reversal of 15938591 is 19583951.

It is a strong prime.

It is an emirp because it is prime and its reverse (19583951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15938591 - 2¹⁰ = 15937567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15938599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7969295 + 7969296.

It is an arithmetic number, because the mean of its divisors is an integer number (7969296).

Almost surely, 2^15938591 is an apocalyptic number.

15938591 is a deficient number, since it is larger than the sum of its proper divisors (1).

15938591 is an equidigital number, since it uses as much as digits as its factorization.

15938591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 15938591 is about 3992.3164954698. The cubic root of 15938591 is about 251.6614196139.

The spelling of 15938591 in words is "fifteen million, nine hundred thirty-eight thousand, five hundred ninety-one".