646346431 has 4 divisors (see below), whose sum is σ = 646531600. Its totient is φ = 646161264.

The previous prime is 646346419. The next prime is 646346489. The reversal of 646346431 is 134643646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646346431 - 2⁵ = 646346399 is a prime.

It is a super-2 number, since 2×646346431² = 835527417732875522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646346411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87246 + ... + 94363.

It is an arithmetic number, because the mean of its divisors is an integer number (161632900).

Almost surely, 2^646346431 is an apocalyptic number.

646346431 is a deficient number, since it is larger than the sum of its proper divisors (185169).

646346431 is a wasteful number, since it uses less digits than its factorization.

646346431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185168.

The product of its digits is 124416, while the sum is 37.

The square root of 646346431 is about 25423.3442135373. The cubic root of 646346431 is about 864.6130475471.

The spelling of 646346431 in words is "six hundred forty-six million, three hundred forty-six thousand, four hundred thirty-one".