631636949 has 4 divisors (see below), whose sum is σ = 642342720. Its totient is φ = 620931180.

The previous prime is 631636927. The next prime is 631636961. The reversal of 631636949 is 949636136.

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 a de Polignac number, because none of the positive numbers 2^k-631636949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631636909) 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, 5352797 + ... + 5352914.

It is an arithmetic number, because the mean of its divisors is an integer number (160585680).

Almost surely, 2^631636949 is an apocalyptic number.

It is an amenable number.

631636949 is a deficient number, since it is larger than the sum of its proper divisors (10705771).

631636949 is a wasteful number, since it uses less digits than its factorization.

631636949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10705770.

The product of its digits is 629856, while the sum is 47.

The square root of 631636949 is about 25132.3884459874. The cubic root of 631636949 is about 858.0037296781.

The spelling of 631636949 in words is "six hundred thirty-one million, six hundred thirty-six thousand, nine hundred forty-nine".