631151947 has 4 divisors (see below), whose sum is σ = 658593360. Its totient is φ = 603710536.

The previous prime is 631151903. The next prime is 631151987. The reversal of 631151947 is 749151136.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 631151947 - 2⁷ = 631151819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631151987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13720672 + ... + 13720717.

It is an arithmetic number, because the mean of its divisors is an integer number (164648340).

Almost surely, 2^631151947 is an apocalyptic number.

631151947 is a deficient number, since it is larger than the sum of its proper divisors (27441413).

631151947 is a wasteful number, since it uses less digits than its factorization.

631151947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27441412.

The product of its digits is 22680, while the sum is 37.

The square root of 631151947 is about 25122.7376493885. The cubic root of 631151947 is about 857.7840675867.

The spelling of 631151947 in words is "six hundred thirty-one million, one hundred fifty-one thousand, nine hundred forty-seven".