392640302491 has 2 divisors, whose sum is σ = 392640302492. Its totient is φ = 392640302490.

The previous prime is 392640302489. The next prime is 392640302543. The reversal of 392640302491 is 194203046293.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 392640302491 - 2¹ = 392640302489 is a prime.

Together with 392640302489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (392640302471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196320151245 + 196320151246.

It is an arithmetic number, because the mean of its divisors is an integer number (196320151246).

Almost surely, 2^392640302491 is an apocalyptic number.

392640302491 is a deficient number, since it is larger than the sum of its proper divisors (1).

392640302491 is an equidigital number, since it uses as much as digits as its factorization.

392640302491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 392640302491 in words is "three hundred ninety-two billion, six hundred forty million, three hundred two thousand, four hundred ninety-one".