391959791953 has 4 divisors (see below), whose sum is σ = 392027063920. Its totient is φ = 391892519988.

The previous prime is 391959791941. The next prime is 391959791959. The reversal of 391959791953 is 359197959193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 391959791953 - 2⁵ = 391959791921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391959791959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33627243 + ... + 33638896.

It is an arithmetic number, because the mean of its divisors is an integer number (98006765980).

Almost surely, 2^391959791953 is an apocalyptic number.

It is an amenable number.

391959791953 is a deficient number, since it is larger than the sum of its proper divisors (67271967).

391959791953 is an equidigital number, since it uses as much as digits as its factorization.

391959791953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67271966.

The product of its digits is 93002175, while the sum is 70.

The spelling of 391959791953 in words is "three hundred ninety-one billion, nine hundred fifty-nine million, seven hundred ninety-one thousand, nine hundred fifty-three".