15131954557 has 2 divisors, whose sum is σ = 15131954558. Its totient is φ = 15131954556.

The previous prime is 15131954543. The next prime is 15131954671. The reversal of 15131954557 is 75545913151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14513984676 + 617969881 = 120474^2 + 24859^2 .

It is a cyclic number.

It is not a de Polignac number, because 15131954557 - 2¹¹ = 15131952509 is a prime.

It is a super-2 number, since 2×15131954557² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15131954527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7565977278 + 7565977279.

It is an arithmetic number, because the mean of its divisors is an integer number (7565977279).

Almost surely, 2^15131954557 is an apocalyptic number.

It is an amenable number.

15131954557 is a deficient number, since it is larger than the sum of its proper divisors (1).

15131954557 is an equidigital number, since it uses as much as digits as its factorization.

15131954557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472500, while the sum is 46.

The spelling of 15131954557 in words is "fifteen billion, one hundred thirty-one million, nine hundred fifty-four thousand, five hundred fifty-seven".