631381252 has 6 divisors (see below), whose sum is σ = 1104917198. Its totient is φ = 315690624.

The previous prime is 631381189. The next prime is 631381253. The reversal of 631381252 is 252183136.

It can be written as a sum of positive squares in only one way, i.e., 592143556 + 39237696 = 24334^2 + 6264^2 .

It is not an unprimeable number, because it can be changed into a prime (631381253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78922653 + ... + 78922660.

Almost surely, 2^631381252 is an apocalyptic number.

It is an amenable number.

631381252 is a deficient number, since it is larger than the sum of its proper divisors (473535946).

631381252 is a wasteful number, since it uses less digits than its factorization.

631381252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157845317 (or 157845315 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 631381252 is about 25127.3009294671. The cubic root of 631381252 is about 857.8879360560.

The spelling of 631381252 in words is "six hundred thirty-one million, three hundred eighty-one thousand, two hundred fifty-two".