239861905961 has 2 divisors, whose sum is σ = 239861905962. Its totient is φ = 239861905960.

The previous prime is 239861905897. The next prime is 239861905963. The reversal of 239861905961 is 169509168932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126398025625 + 113463880336 = 355525^2 + 336844^2 .

It is a cyclic number.

It is not a de Polignac number, because 239861905961 - 2⁶ = 239861905897 is a prime.

Together with 239861905963, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 239861905961.

It is not a weakly prime, because it can be changed into another prime (239861905963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119930952980 + 119930952981.

It is an arithmetic number, because the mean of its divisors is an integer number (119930952981).

Almost surely, 2^239861905961 is an apocalyptic number.

It is an amenable number.

239861905961 is a deficient number, since it is larger than the sum of its proper divisors (1).

239861905961 is an equidigital number, since it uses as much as digits as its factorization.

239861905961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 59.

The spelling of 239861905961 in words is "two hundred thirty-nine billion, eight hundred sixty-one million, nine hundred five thousand, nine hundred sixty-one".