15730681 has 2 divisors, whose sum is σ = 15730682. Its totient is φ = 15730680.

The previous prime is 15730679. The next prime is 15730709. The reversal of 15730681 is 18603751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 5103081 = 3260^2 + 2259^2 .

It is a cyclic number.

It is not a de Polignac number, because 15730681 - 2¹ = 15730679 is a prime.

It is a super-2 number, since 2×15730681² = 494908649447522, which contains 22 as substring.

Together with 15730679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15730621) 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, 7865340 + 7865341.

It is an arithmetic number, because the mean of its divisors is an integer number (7865341).

Almost surely, 2^15730681 is an apocalyptic number.

It is an amenable number.

15730681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15730681 is an equidigital number, since it uses as much as digits as its factorization.

15730681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 15730681 is about 3966.1922545434. The cubic root of 15730681 is about 250.5623660293.

The spelling of 15730681 in words is "fifteen million, seven hundred thirty thousand, six hundred eighty-one".