39099975961 has 2 divisors, whose sum is σ = 39099975962. Its totient is φ = 39099975960.

The previous prime is 39099975947. The next prime is 39099975989. The reversal of 39099975961 is 16957999093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19679881225 + 19420094736 = 140285^2 + 139356^2 .

It is a cyclic number.

It is not a de Polignac number, because 39099975961 - 2⁹ = 39099975449 is a prime.

It is not a weakly prime, because it can be changed into another prime (39099975931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19549987980 + 19549987981.

It is an arithmetic number, because the mean of its divisors is an integer number (19549987981).

Almost surely, 2^39099975961 is an apocalyptic number.

It is an amenable number.

39099975961 is a deficient number, since it is larger than the sum of its proper divisors (1).

39099975961 is an equidigital number, since it uses as much as digits as its factorization.

39099975961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37200870, while the sum is 67.

The spelling of 39099975961 in words is "thirty-nine billion, ninety-nine million, nine hundred seventy-five thousand, nine hundred sixty-one".