231912269 has 2 divisors, whose sum is σ = 231912270. Its totient is φ = 231912268.

The previous prime is 231912253. The next prime is 231912299. The reversal of 231912269 is 962219132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120187369 + 111724900 = 10963^2 + 10570^2 .

It is a cyclic number.

It is not a de Polignac number, because 231912269 - 2⁴ = 231912253 is a prime.

It is a super-2 number, since 2×231912269² = 107566601025456722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231912299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115956134 + 115956135.

It is an arithmetic number, because the mean of its divisors is an integer number (115956135).

Almost surely, 2^231912269 is an apocalyptic number.

It is an amenable number.

231912269 is a deficient number, since it is larger than the sum of its proper divisors (1).

231912269 is an equidigital number, since it uses as much as digits as its factorization.

231912269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 231912269 is about 15228.6660282508. Note that the first 3 decimals coincide. The cubic root of 231912269 is about 614.3859020884.

The spelling of 231912269 in words is "two hundred thirty-one million, nine hundred twelve thousand, two hundred sixty-nine".