15871572989 has 2 divisors, whose sum is σ = 15871572990. Its totient is φ = 15871572988.

The previous prime is 15871572971. The next prime is 15871573001. The reversal of 15871572989 is 98927517851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11779412089 + 4092160900 = 108533^2 + 63970^2 .

It is a cyclic number.

It is not a de Polignac number, because 15871572989 - 2⁸ = 15871572733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15871572089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7935786494 + 7935786495.

It is an arithmetic number, because the mean of its divisors is an integer number (7935786495).

Almost surely, 2^15871572989 is an apocalyptic number.

It is an amenable number.

15871572989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15871572989 is an equidigital number, since it uses as much as digits as its factorization.

15871572989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 62.

The spelling of 15871572989 in words is "fifteen billion, eight hundred seventy-one million, five hundred seventy-two thousand, nine hundred eighty-nine".