861931883 has 2 divisors, whose sum is σ = 861931884. Its totient is φ = 861931882.

The previous prime is 861931867. The next prime is 861931897. The reversal of 861931883 is 388139168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861931883 - 2⁴ = 861931867 is a prime.

It is not a weakly prime, because it can be changed into another prime (861931783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430965941 + 430965942.

It is an arithmetic number, because the mean of its divisors is an integer number (430965942).

Almost surely, 2^861931883 is an apocalyptic number.

861931883 is a deficient number, since it is larger than the sum of its proper divisors (1).

861931883 is an equidigital number, since it uses as much as digits as its factorization.

861931883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 861931883 is about 29358.6764517749. The cubic root of 861931883 is about 951.6800862757.

The spelling of 861931883 in words is "eight hundred sixty-one million, nine hundred thirty-one thousand, eight hundred eighty-three".