15712913581 has 2 divisors, whose sum is σ = 15712913582. Its totient is φ = 15712913580.

The previous prime is 15712913521. The next prime is 15712913591. The reversal of 15712913581 is 18531921751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14367857956 + 1345055625 = 119866^2 + 36675^2 .

It is a cyclic number.

It is not a de Polignac number, because 15712913581 - 2¹⁷ = 15712782509 is a prime.

It is a super-2 number, since 2×15712913581² (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 (15712913521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7856456790 + 7856456791.

It is an arithmetic number, because the mean of its divisors is an integer number (7856456791).

Almost surely, 2^15712913581 is an apocalyptic number.

It is an amenable number.

15712913581 is a deficient number, since it is larger than the sum of its proper divisors (1).

15712913581 is an equidigital number, since it uses as much as digits as its factorization.

15712913581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 43.

The spelling of 15712913581 in words is "fifteen billion, seven hundred twelve million, nine hundred thirteen thousand, five hundred eighty-one".