381978385931 has 2 divisors, whose sum is σ = 381978385932. Its totient is φ = 381978385930.

The previous prime is 381978385897. The next prime is 381978385939. The reversal of 381978385931 is 139583879183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381978385931 - 2²⁶ = 381911277067 is a prime.

It is a super-2 number, since 2×381978385931² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (381978385939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190989192965 + 190989192966.

It is an arithmetic number, because the mean of its divisors is an integer number (190989192966).

Almost surely, 2^381978385931 is an apocalyptic number.

381978385931 is a deficient number, since it is larger than the sum of its proper divisors (1).

381978385931 is an equidigital number, since it uses as much as digits as its factorization.

381978385931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 65.

The spelling of 381978385931 in words is "three hundred eighty-one billion, nine hundred seventy-eight million, three hundred eighty-five thousand, nine hundred thirty-one".