391552963 has 2 divisors, whose sum is σ = 391552964. Its totient is φ = 391552962.

The previous prime is 391552939. The next prime is 391552979. The reversal of 391552963 is 369255193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391552963 - 2²¹ = 389455811 is a prime.

It is not a weakly prime, because it can be changed into another prime (391552913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195776481 + 195776482.

It is an arithmetic number, because the mean of its divisors is an integer number (195776482).

Almost surely, 2^391552963 is an apocalyptic number.

391552963 is a deficient number, since it is larger than the sum of its proper divisors (1).

391552963 is an equidigital number, since it uses as much as digits as its factorization.

391552963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 43.

The square root of 391552963 is about 19787.6972637040. The cubic root of 391552963 is about 731.5828312426.

The spelling of 391552963 in words is "three hundred ninety-one million, five hundred fifty-two thousand, nine hundred sixty-three".