631730986 has 4 divisors (see below), whose sum is σ = 947596482. Its totient is φ = 315865492.

The previous prime is 631730971. The next prime is 631730987. The reversal of 631730986 is 689037136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 603439225 + 28291761 = 24565^2 + 5319^2 .

It is not an unprimeable number, because it can be changed into a prime (631730987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157932745 + ... + 157932748.

Almost surely, 2^631730986 is an apocalyptic number.

631730986 is a deficient number, since it is larger than the sum of its proper divisors (315865496).

631730986 is a wasteful number, since it uses less digits than its factorization.

631730986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315865495.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 631730986 is about 25134.2592092944. The cubic root of 631730986 is about 858.0463069282.

The spelling of 631730986 in words is "six hundred thirty-one million, seven hundred thirty thousand, nine hundred eighty-six".