690320231 has 2 divisors, whose sum is σ = 690320232. Its totient is φ = 690320230.

The previous prime is 690320203. The next prime is 690320233. The reversal of 690320231 is 132023096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690320231 - 2⁶ = 690320167 is a prime.

It is a super-2 number, since 2×690320231² = 953084042655786722, which contains 22 as substring.

Together with 690320233, 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 690320231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690320233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345160115 + 345160116.

It is an arithmetic number, because the mean of its divisors is an integer number (345160116).

Almost surely, 2^690320231 is an apocalyptic number.

690320231 is a deficient number, since it is larger than the sum of its proper divisors (1).

690320231 is an equidigital number, since it uses as much as digits as its factorization.

690320231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 690320231 is about 26273.9458589683. The cubic root of 690320231 is about 883.7922734717.

The spelling of 690320231 in words is "six hundred ninety million, three hundred twenty thousand, two hundred thirty-one".