15721373 has 2 divisors, whose sum is σ = 15721374. Its totient is φ = 15721372.

The previous prime is 15721369. The next prime is 15721421. The reversal of 15721373 is 37312751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14417209 + 1304164 = 3797^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 15721373 - 2² = 15721369 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15721313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860686 + 7860687.

It is an arithmetic number, because the mean of its divisors is an integer number (7860687).

Almost surely, 2^15721373 is an apocalyptic number.

It is an amenable number.

15721373 is a deficient number, since it is larger than the sum of its proper divisors (1).

15721373 is an equidigital number, since it uses as much as digits as its factorization.

15721373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 29.

The square root of 15721373 is about 3965.0186632600. The cubic root of 15721373 is about 250.5129361994.

The spelling of 15721373 in words is "fifteen million, seven hundred twenty-one thousand, three hundred seventy-three".