15721159 has 2 divisors, whose sum is σ = 15721160. Its totient is φ = 15721158.

The previous prime is 15721157. The next prime is 15721169. The reversal of 15721159 is 95112751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15721159 - 2¹ = 15721157 is a prime.

Together with 15721157, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15721159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15721157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7860579 + 7860580.

It is an arithmetic number, because the mean of its divisors is an integer number (7860580).

Almost surely, 2^15721159 is an apocalyptic number.

15721159 is a deficient number, since it is larger than the sum of its proper divisors (1).

15721159 is an equidigital number, since it uses as much as digits as its factorization.

15721159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 31.

The square root of 15721159 is about 3964.9916771665. The cubic root of 15721159 is about 250.5117995300.

It can be divided in two parts, 157 and 21159, that added together give a square (21316 = 146²).

The spelling of 15721159 in words is "fifteen million, seven hundred twenty-one thousand, one hundred fifty-nine".