631363231 has 2 divisors, whose sum is σ = 631363232. Its totient is φ = 631363230.

The previous prime is 631363219. The next prime is 631363259. The reversal of 631363231 is 132363136.

It is an a-pointer prime, because the next prime (631363259) can be obtained adding 631363231 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631363231 is a prime.

It is a super-2 number, since 2×631363231² = 797239058917518722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 631363231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631363531) 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 as a sum of consecutive naturals, namely, 315681615 + 315681616.

It is an arithmetic number, because the mean of its divisors is an integer number (315681616).

Almost surely, 2^631363231 is an apocalyptic number.

631363231 is a deficient number, since it is larger than the sum of its proper divisors (1).

631363231 is an equidigital number, since it uses as much as digits as its factorization.

631363231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 28.

The square root of 631363231 is about 25126.9423328824. The cubic root of 631363231 is about 857.8797739799.

The spelling of 631363231 in words is "six hundred thirty-one million, three hundred sixty-three thousand, two hundred thirty-one".