646226731 has 2 divisors, whose sum is σ = 646226732. Its totient is φ = 646226730.

The previous prime is 646226723. The next prime is 646226761. The reversal of 646226731 is 137622646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646226731 - 2³ = 646226723 is a prime.

It is a super-2 number, since 2×646226731² = 835217975717892722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646226761) 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, 323113365 + 323113366.

It is an arithmetic number, because the mean of its divisors is an integer number (323113366).

Almost surely, 2^646226731 is an apocalyptic number.

646226731 is a deficient number, since it is larger than the sum of its proper divisors (1).

646226731 is an equidigital number, since it uses as much as digits as its factorization.

646226731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 646226731 is about 25420.9899689214. The cubic root of 646226731 is about 864.5596703043.

The spelling of 646226731 in words is "six hundred forty-six million, two hundred twenty-six thousand, seven hundred thirty-one".