231085469 has 2 divisors, whose sum is σ = 231085470. Its totient is φ = 231085468.

The previous prime is 231085457. The next prime is 231085489. The reversal of 231085469 is 964580132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194965369 + 36120100 = 13963^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 231085469 - 2⁴ = 231085453 is a prime.

It is a super-2 number, since 2×231085469² = 106800987965899922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231085489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115542734 + 115542735.

It is an arithmetic number, because the mean of its divisors is an integer number (115542735).

Almost surely, 2^231085469 is an apocalyptic number.

It is an amenable number.

231085469 is a deficient number, since it is larger than the sum of its proper divisors (1).

231085469 is an equidigital number, since it uses as much as digits as its factorization.

231085469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 231085469 is about 15201.4956172082. The cubic root of 231085469 is about 613.6549085231.

The spelling of 231085469 in words is "two hundred thirty-one million, eighty-five thousand, four hundred sixty-nine".