391090468501 has 2 divisors, whose sum is σ = 391090468502. Its totient is φ = 391090468500.

The previous prime is 391090468493. The next prime is 391090468513. The reversal of 391090468501 is 105864090193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336649446225 + 54441022276 = 580215^2 + 233326^2 .

It is a cyclic number.

It is not a de Polignac number, because 391090468501 - 2³ = 391090468493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391090468541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195545234250 + 195545234251.

It is an arithmetic number, because the mean of its divisors is an integer number (195545234251).

Almost surely, 2^391090468501 is an apocalyptic number.

It is an amenable number.

391090468501 is a deficient number, since it is larger than the sum of its proper divisors (1).

391090468501 is an equidigital number, since it uses as much as digits as its factorization.

391090468501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 391090468501 in words is "three hundred ninety-one billion, ninety million, four hundred sixty-eight thousand, five hundred one".