391136514689 has 2 divisors, whose sum is σ = 391136514690. Its totient is φ = 391136514688.

The previous prime is 391136514677. The next prime is 391136514733. The reversal of 391136514689 is 986415631193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305853241600 + 85283273089 = 553040^2 + 292033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391136514689 is a prime.

It is not a weakly prime, because it can be changed into another prime (391136514089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195568257344 + 195568257345.

It is an arithmetic number, because the mean of its divisors is an integer number (195568257345).

Almost surely, 2^391136514689 is an apocalyptic number.

It is an amenable number.

391136514689 is a deficient number, since it is larger than the sum of its proper divisors (1).

391136514689 is an equidigital number, since it uses as much as digits as its factorization.

391136514689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4199040, while the sum is 56.

The spelling of 391136514689 in words is "three hundred ninety-one billion, one hundred thirty-six million, five hundred fourteen thousand, six hundred eighty-nine".