15491491 has 2 divisors, whose sum is σ = 15491492. Its totient is φ = 15491490.

The previous prime is 15491477. The next prime is 15491501. The reversal of 15491491 is 19419451.

15491491 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 is a cyclic number.

It is not a de Polignac number, because 15491491 - 2⁵ = 15491459 is a prime.

It is not a weakly prime, because it can be changed into another prime (15491401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7745745 + 7745746.

It is an arithmetic number, because the mean of its divisors is an integer number (7745746).

Almost surely, 2^15491491 is an apocalyptic number.

15491491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15491491 is an equidigital number, since it uses as much as digits as its factorization.

15491491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The square root of 15491491 is about 3935.9231445749. The cubic root of 15491491 is about 249.2859142683.

The spelling of 15491491 in words is "fifteen million, four hundred ninety-one thousand, four hundred ninety-one".