15399491 has 2 divisors, whose sum is σ = 15399492. Its totient is φ = 15399490.

The previous prime is 15399479. The next prime is 15399499. The reversal of 15399491 is 19499351.

It is a strong prime.

It is an emirp because it is prime and its reverse (19499351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15399491 - 2¹⁴ = 15383107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15399499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7699745 + 7699746.

It is an arithmetic number, because the mean of its divisors is an integer number (7699746).

Almost surely, 2^15399491 is an apocalyptic number.

15399491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15399491 is an equidigital number, since it uses as much as digits as its factorization.

15399491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 41.

The square root of 15399491 is about 3924.2185209287. The cubic root of 15399491 is about 248.7914523985.

The spelling of 15399491 in words is "fifteen million, three hundred ninety-nine thousand, four hundred ninety-one".