391358245945 has 4 divisors (see below), whose sum is σ = 469629895140. Its totient is φ = 313086596752.

The previous prime is 391358245937. The next prime is 391358245979. The reversal of 391358245945 is 549542853193.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108277851136 + 283080394809 = 329056^2 + 532053^2 .

It is a cyclic number.

It is not a de Polignac number, because 391358245945 - 2³ = 391358245937 is a prime.

It is a super-2 number, since 2×391358245945² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 391358245945.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39135824590 + ... + 39135824599.

It is an arithmetic number, because the mean of its divisors is an integer number (117407473785).

Almost surely, 2^391358245945 is an apocalyptic number.

It is an amenable number.

391358245945 is a deficient number, since it is larger than the sum of its proper divisors (78271649195).

391358245945 is an equidigital number, since it uses as much as digits as its factorization.

391358245945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78271649194.

The product of its digits is 23328000, while the sum is 58.

The spelling of 391358245945 in words is "three hundred ninety-one billion, three hundred fifty-eight million, two hundred forty-five thousand, nine hundred forty-five".