690312231 has 24 divisors (see below), whose sum is σ = 1145368224. Its totient is φ = 392454720.

The previous prime is 690312223. The next prime is 690312263. The reversal of 690312231 is 132213096.

It is not a de Polignac number, because 690312231 - 2³ = 690312223 is a prime.

It is a super-2 number, since 2×690312231² = 953061952536394722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690312195 and 690312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690312211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15400 + ... + 40221.

It is an arithmetic number, because the mean of its divisors is an integer number (47723676).

Almost surely, 2^690312231 is an apocalyptic number.

690312231 is a deficient number, since it is larger than the sum of its proper divisors (455055993).

690312231 is a wasteful number, since it uses less digits than its factorization.

690312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55831 (or 55828 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 690312231 is about 26273.7936164536. The cubic root of 690312231 is about 883.7888594207.

The spelling of 690312231 in words is "six hundred ninety million, three hundred twelve thousand, two hundred thirty-one".