231906529 has 2 divisors, whose sum is σ = 231906530. Its totient is φ = 231906528.

The previous prime is 231906487. The next prime is 231906551. The reversal of 231906529 is 925609132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216090000 + 15816529 = 14700^2 + 3977^2 .

It is a cyclic number.

It is not a de Polignac number, because 231906529 - 2²⁵ = 198352097 is a prime.

It is not a weakly prime, because it can be changed into another prime (231906569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115953264 + 115953265.

It is an arithmetic number, because the mean of its divisors is an integer number (115953265).

Almost surely, 2^231906529 is an apocalyptic number.

It is an amenable number.

231906529 is a deficient number, since it is larger than the sum of its proper divisors (1).

231906529 is an equidigital number, since it uses as much as digits as its factorization.

231906529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 231906529 is about 15228.4775667169. The cubic root of 231906529 is about 614.3808332115.

The spelling of 231906529 in words is "two hundred thirty-one million, nine hundred six thousand, five hundred twenty-nine".