9131989961 has 2 divisors, whose sum is σ = 9131989962. Its totient is φ = 9131989960.

The previous prime is 9131989949. The next prime is 9131989987. The reversal of 9131989961 is 1699891319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6244002361 + 2887987600 = 79019^2 + 53740^2 .

It is a cyclic number.

It is not a de Polignac number, because 9131989961 - 2²⁶ = 9064881097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9131989897 and 9131989906.

It is not a weakly prime, because it can be changed into another prime (9131983961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565994980 + 4565994981.

It is an arithmetic number, because the mean of its divisors is an integer number (4565994981).

Almost surely, 2^9131989961 is an apocalyptic number.

It is an amenable number.

9131989961 is a deficient number, since it is larger than the sum of its proper divisors (1).

9131989961 is an equidigital number, since it uses as much as digits as its factorization.

9131989961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 56.

The square root of 9131989961 is about 95561.4459968035. The cubic root of 9131989961 is about 2090.2030404148.

The spelling of 9131989961 in words is "nine billion, one hundred thirty-one million, nine hundred eighty-nine thousand, nine hundred sixty-one".