391961560099 has 2 divisors, whose sum is σ = 391961560100. Its totient is φ = 391961560098.

The previous prime is 391961560043. The next prime is 391961560127. The reversal of 391961560099 is 990065169193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391961560099 - 2²⁷ = 391827342371 is a prime.

It is not a weakly prime, because it can be changed into another prime (391961560699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195980780049 + 195980780050.

It is an arithmetic number, because the mean of its divisors is an integer number (195980780050).

Almost surely, 2^391961560099 is an apocalyptic number.

391961560099 is a deficient number, since it is larger than the sum of its proper divisors (1).

391961560099 is an equidigital number, since it uses as much as digits as its factorization.

391961560099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3542940, while the sum is 58.

The spelling of 391961560099 in words is "three hundred ninety-one billion, nine hundred sixty-one million, five hundred sixty thousand, ninety-nine".