15253231991 has 2 divisors, whose sum is σ = 15253231992. Its totient is φ = 15253231990.

The previous prime is 15253231969. The next prime is 15253232011. The reversal of 15253231991 is 19913235251.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15253231991 is a prime.

It is a super-2 number, since 2×15253231991² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15253231891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7626615995 + 7626615996.

It is an arithmetic number, because the mean of its divisors is an integer number (7626615996).

Almost surely, 2^15253231991 is an apocalyptic number.

15253231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15253231991 is an equidigital number, since it uses as much as digits as its factorization.

15253231991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The spelling of 15253231991 in words is "fifteen billion, two hundred fifty-three million, two hundred thirty-one thousand, nine hundred ninety-one".