649631431 has 4 divisors (see below), whose sum is σ = 650702272. Its totient is φ = 648560592.

The previous prime is 649631399. The next prime is 649631467. The reversal of 649631431 is 134136946.

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 649631431 - 2⁵ = 649631399 is a prime.

It is a super-2 number, since 2×649631431² = 844041992286215522, 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 (649631491) 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, 534510 + ... + 535723.

It is an arithmetic number, because the mean of its divisors is an integer number (162675568).

Almost surely, 2^649631431 is an apocalyptic number.

649631431 is a deficient number, since it is larger than the sum of its proper divisors (1070841).

649631431 is a wasteful number, since it uses less digits than its factorization.

649631431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070840.

The product of its digits is 46656, while the sum is 37.

The square root of 649631431 is about 25487.8683102373. The cubic root of 649631431 is about 866.0753467538.

The spelling of 649631431 in words is "six hundred forty-nine million, six hundred thirty-one thousand, four hundred thirty-one".