646594431 has 32 divisors (see below), whose sum is σ = 1001003520. Its totient is φ = 363636864.

The previous prime is 646594409. The next prime is 646594471. The reversal of 646594431 is 134495646.

It is a happy number.

It is not a de Polignac number, because 646594431 - 2⁶ = 646594367 is a prime.

It is a super-2 number, since 2×646594431² = 836168716400427522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646594471) 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 in 31 ways as a sum of consecutive naturals, for example, 372241 + ... + 373973.

It is an arithmetic number, because the mean of its divisors is an integer number (31281360).

Almost surely, 2^646594431 is an apocalyptic number.

646594431 is a deficient number, since it is larger than the sum of its proper divisors (354409089).

646594431 is a wasteful number, since it uses less digits than its factorization.

646594431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

The product of its digits is 311040, while the sum is 42.

The square root of 646594431 is about 25428.2211528844. The cubic root of 646594431 is about 864.7236160219.

The spelling of 646594431 in words is "six hundred forty-six million, five hundred ninety-four thousand, four hundred thirty-one".