631632749 has 4 divisors (see below), whose sum is σ = 689053920. Its totient is φ = 574211580.

The previous prime is 631632737. The next prime is 631632769. The reversal of 631632749 is 947236136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631632749 - 2²⁰ = 630584173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631632769) 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, 28710569 + ... + 28710590.

It is an arithmetic number, because the mean of its divisors is an integer number (172263480).

Almost surely, 2^631632749 is an apocalyptic number.

It is an amenable number.

631632749 is a deficient number, since it is larger than the sum of its proper divisors (57421171).

631632749 is a wasteful number, since it uses less digits than its factorization.

631632749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57421170.

The product of its digits is 163296, while the sum is 41.

The square root of 631632749 is about 25132.3048883305. The cubic root of 631632749 is about 858.0018279402.

The spelling of 631632749 in words is "six hundred thirty-one million, six hundred thirty-two thousand, seven hundred forty-nine".