631128267157231 has 4 divisors (see below), whose sum is σ = 631168649044200. Its totient is φ = 631087885270264.

The previous prime is 631128267157151. The next prime is 631128267157301. The reversal of 631128267157231 is 132751762821136.

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 631128267157231 - 2⁹ = 631128267156719 is a prime.

It is a super-2 number, since 2×631128267157231² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631128267157831) 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, 20190920041 + ... + 20190951298.

It is an arithmetic number, because the mean of its divisors is an integer number (157792162261050).

Almost surely, 2^{631128267157231} is an apocalyptic number.

631128267157231 is a deficient number, since it is larger than the sum of its proper divisors (40381886969).

631128267157231 is a wasteful number, since it uses less digits than its factorization.

631128267157231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40381886968.

The product of its digits is 5080320, while the sum is 55.

The spelling of 631128267157231 in words is "six hundred thirty-one trillion, one hundred twenty-eight billion, two hundred sixty-seven million, one hundred fifty-seven thousand, two hundred thirty-one".