731630231 has 2 divisors, whose sum is σ = 731630232. Its totient is φ = 731630230.

The previous prime is 731630213. The next prime is 731630233. The reversal of 731630231 is 132036137.

Together with previous prime (731630213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 731630231 - 2⁶ = 731630167 is a prime.

It is a super-2 number, since 2×731630231² = 1070565589826226722, which contains 22 as substring.

Together with 731630233, it forms a pair of twin primes.

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 731630231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (731630233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365815115 + 365815116.

It is an arithmetic number, because the mean of its divisors is an integer number (365815116).

Almost surely, 2^731630231 is an apocalyptic number.

731630231 is a deficient number, since it is larger than the sum of its proper divisors (1).

731630231 is an equidigital number, since it uses as much as digits as its factorization.

731630231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 731630231 is about 27048.6641259786. The cubic root of 731630231 is about 901.0811004261.

Adding to 731630231 its reverse (132036137), we get a palindrome (863666368).

The spelling of 731630231 in words is "seven hundred thirty-one million, six hundred thirty thousand, two hundred thirty-one".