631001980 has 48 divisors (see below), whose sum is σ = 1537030656. Its totient is φ = 213111360.

The previous prime is 631001977. The next prime is 631002017. The reversal of 631001980 is 89100136.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24256 + ... + 43015.

It is an arithmetic number, because the mean of its divisors is an integer number (32021472).

Almost surely, 2^631001980 is an apocalyptic number.

It is an amenable number.

631001980 is an abundant number, since it is smaller than the sum of its proper divisors (906028676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631001980 is a wasteful number, since it uses less digits than its factorization.

631001980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67354 (or 67352 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 631001980 is about 25119.7527854077. The cubic root of 631001980 is about 857.7161233070.

The spelling of 631001980 in words is "six hundred thirty-one million, one thousand, nine hundred eighty".