15251431681 has 2 divisors, whose sum is σ = 15251431682. Its totient is φ = 15251431680.

The previous prime is 15251431669. The next prime is 15251431693. The reversal of 15251431681 is 18613415251.

It is a balanced prime because it is at equal distance from previous prime (15251431669) and next prime (15251431693).

It can be written as a sum of positive squares in only one way, i.e., 13188455281 + 2062976400 = 114841^2 + 45420^2 .

It is a cyclic number.

It is not a de Polignac number, because 15251431681 - 2⁵ = 15251431649 is a prime.

It is a super-2 number, since 2×15251431681² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15251431681.

It is not a weakly prime, because it can be changed into another prime (15251431661) 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, 7625715840 + 7625715841.

It is an arithmetic number, because the mean of its divisors is an integer number (7625715841).

Almost surely, 2^15251431681 is an apocalyptic number.

It is an amenable number.

15251431681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15251431681 is an equidigital number, since it uses as much as digits as its factorization.

15251431681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The spelling of 15251431681 in words is "fifteen billion, two hundred fifty-one million, four hundred thirty-one thousand, six hundred eighty-one".