631888898 has 4 divisors (see below), whose sum is σ = 947833350. Its totient is φ = 315944448.

The previous prime is 631888891. The next prime is 631888951. The reversal of 631888898 is 898888136.

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., 545082409 + 86806489 = 23347^2 + 9317^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631888891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157972223 + ... + 157972226.

Almost surely, 2^631888898 is an apocalyptic number.

631888898 is a deficient number, since it is larger than the sum of its proper divisors (315944452).

631888898 is a wasteful number, since it uses less digits than its factorization.

631888898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315944451.

The product of its digits is 5308416, while the sum is 59.

The square root of 631888898 is about 25137.4003826967. The cubic root of 631888898 is about 858.1177954379.

The spelling of 631888898 in words is "six hundred thirty-one million, eight hundred eighty-eight thousand, eight hundred ninety-eight".