15787130731 has 2 divisors, whose sum is σ = 15787130732. Its totient is φ = 15787130730.

The previous prime is 15787130717. The next prime is 15787130771. The reversal of 15787130731 is 13703178751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15787130731 - 2¹⁷ = 15786999659 is a prime.

It is a super-2 number, since 2×15787130731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15787130771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7893565365 + 7893565366.

It is an arithmetic number, because the mean of its divisors is an integer number (7893565366).

Almost surely, 2^15787130731 is an apocalyptic number.

15787130731 is a deficient number, since it is larger than the sum of its proper divisors (1).

15787130731 is an equidigital number, since it uses as much as digits as its factorization.

15787130731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 43.

The spelling of 15787130731 in words is "fifteen billion, seven hundred eighty-seven million, one hundred thirty thousand, seven hundred thirty-one".