631238143 has 4 divisors (see below), whose sum is σ = 633753288. Its totient is φ = 628723000.

The previous prime is 631238129. The next prime is 631238147. The reversal of 631238143 is 341832136.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631238143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631238147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1257196 + ... + 1257697.

It is an arithmetic number, because the mean of its divisors is an integer number (158438322).

Almost surely, 2^631238143 is an apocalyptic number.

631238143 is a deficient number, since it is larger than the sum of its proper divisors (2515145).

631238143 is a wasteful number, since it uses less digits than its factorization.

631238143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515144.

The product of its digits is 10368, while the sum is 31.

The square root of 631238143 is about 25124.4530885749. The cubic root of 631238143 is about 857.8231148083.

The spelling of 631238143 in words is "six hundred thirty-one million, two hundred thirty-eight thousand, one hundred forty-three".