30977983391 has 2 divisors, whose sum is σ = 30977983392. Its totient is φ = 30977983390.

The previous prime is 30977983319. The next prime is 30977983403. The reversal of 30977983391 is 19338977903.

Together with previous prime (30977983319) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30977983391 - 2³⁰ = 29904241567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30977983391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30977983301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15488991695 + 15488991696.

It is an arithmetic number, because the mean of its divisors is an integer number (15488991696).

Almost surely, 2^30977983391 is an apocalyptic number.

30977983391 is a deficient number, since it is larger than the sum of its proper divisors (1).

30977983391 is an equidigital number, since it uses as much as digits as its factorization.

30977983391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7715736, while the sum is 59.

The spelling of 30977983391 in words is "thirty billion, nine hundred seventy-seven million, nine hundred eighty-three thousand, three hundred ninety-one".