631944436 has 6 divisors (see below), whose sum is σ = 1105902770. Its totient is φ = 315972216.

The previous prime is 631944431. The next prime is 631944479. The reversal of 631944436 is 634449136.

It can be written as a sum of positive squares in only one way, i.e., 449694436 + 182250000 = 21206^2 + 13500^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631944431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78993051 + ... + 78993058.

Almost surely, 2^631944436 is an apocalyptic number.

It is an amenable number.

631944436 is a deficient number, since it is larger than the sum of its proper divisors (473958334).

631944436 is a wasteful number, since it uses less digits than its factorization.

631944436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157986113 (or 157986111 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 631944436 is about 25138.5050470389. The cubic root of 631944436 is about 858.1429352739.

The spelling of 631944436 in words is "six hundred thirty-one million, nine hundred forty-four thousand, four hundred thirty-six".