646976394131 has 2 divisors, whose sum is σ = 646976394132. Its totient is φ = 646976394130.

The previous prime is 646976394121. The next prime is 646976394193. The reversal of 646976394131 is 131493679646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646976394131 - 2⁶ = 646976394067 is a prime.

It is a super-2 number, since 2×646976394131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646976394121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323488197065 + 323488197066.

It is an arithmetic number, because the mean of its divisors is an integer number (323488197066).

Almost surely, 2^646976394131 is an apocalyptic number.

646976394131 is a deficient number, since it is larger than the sum of its proper divisors (1).

646976394131 is an equidigital number, since it uses as much as digits as its factorization.

646976394131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 59.

The spelling of 646976394131 in words is "six hundred forty-six billion, nine hundred seventy-six million, three hundred ninety-four thousand, one hundred thirty-one".