15581430961 has 2 divisors, whose sum is σ = 15581430962. Its totient is φ = 15581430960.

The previous prime is 15581430919. The next prime is 15581431003. The reversal of 15581430961 is 16903418551.

It is a balanced prime because it is at equal distance from previous prime (15581430919) and next prime (15581431003).

It can be written as a sum of positive squares in only one way, i.e., 10372200336 + 5209230625 = 101844^2 + 72175^2 .

It is a cyclic number.

It is not a de Polignac number, because 15581430961 - 2¹⁵ = 15581398193 is a prime.

It is not a weakly prime, because it can be changed into another prime (15581440961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7790715480 + 7790715481.

It is an arithmetic number, because the mean of its divisors is an integer number (7790715481).

Almost surely, 2^15581430961 is an apocalyptic number.

It is an amenable number.

15581430961 is a deficient number, since it is larger than the sum of its proper divisors (1).

15581430961 is an equidigital number, since it uses as much as digits as its factorization.

15581430961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 15581430961 in words is "fifteen billion, five hundred eighty-one million, four hundred thirty thousand, nine hundred sixty-one".