231209523 has 12 divisors (see below), whose sum is σ = 335112960. Its totient is φ = 153611856.

The previous prime is 231209521. The next prime is 231209551. The reversal of 231209523 is 325902132.

It is not a de Polignac number, because 231209523 - 2¹ = 231209521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231209521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41203 + ... + 46476.

It is an arithmetic number, because the mean of its divisors is an integer number (27926080).

Almost surely, 2^231209523 is an apocalyptic number.

231209523 is a deficient number, since it is larger than the sum of its proper divisors (103903437).

231209523 is a wasteful number, since it uses less digits than its factorization.

231209523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87978 (or 87975 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 231209523 is about 15205.5753919409. The cubic root of 231209523 is about 613.7646986772.

The spelling of 231209523 in words is "two hundred thirty-one million, two hundred nine thousand, five hundred twenty-three".