15713921 has 2 divisors, whose sum is σ = 15713922. Its totient is φ = 15713920.

The previous prime is 15713909. The next prime is 15713927. The reversal of 15713921 is 12931751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 625 = 3964^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 15713921 - 2⁶ = 15713857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15713927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856960 + 7856961.

It is an arithmetic number, because the mean of its divisors is an integer number (7856961).

Almost surely, 2^15713921 is an apocalyptic number.

It is an amenable number.

15713921 is a deficient number, since it is larger than the sum of its proper divisors (1).

15713921 is an equidigital number, since it uses as much as digits as its factorization.

15713921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 29.

The square root of 15713921 is about 3964.0788337267. The cubic root of 15713921 is about 250.4733485324.

The spelling of 15713921 in words is "fifteen million, seven hundred thirteen thousand, nine hundred twenty-one".