631738249 has 4 divisors (see below), whose sum is σ = 632600836. Its totient is φ = 630875664.

The previous prime is 631738231. The next prime is 631738271. The reversal of 631738249 is 942837136.

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

It can be written as a sum of positive squares in 2 ways, for example, as 580472649 + 51265600 = 24093^2 + 7160^2 .

It is a cyclic number.

It is not a de Polignac number, because 631738249 - 2²³ = 623349641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631738949) 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, 430194 + ... + 431659.

It is an arithmetic number, because the mean of its divisors is an integer number (158150209).

Almost surely, 2^631738249 is an apocalyptic number.

It is an amenable number.

631738249 is a deficient number, since it is larger than the sum of its proper divisors (862587).

631738249 is an equidigital number, since it uses as much as digits as its factorization.

631738249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862586.

The product of its digits is 217728, while the sum is 43.

The square root of 631738249 is about 25134.4036929464. The cubic root of 631738249 is about 858.0495952300.

The spelling of 631738249 in words is "six hundred thirty-one million, seven hundred thirty-eight thousand, two hundred forty-nine".