231533539 has 2 divisors, whose sum is σ = 231533540. Its totient is φ = 231533538.

The previous prime is 231533503. The next prime is 231533579. The reversal of 231533539 is 935335132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231533539 - 2¹³ = 231525347 is a prime.

It is not a weakly prime, because it can be changed into another prime (231533579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115766769 + 115766770.

It is an arithmetic number, because the mean of its divisors is an integer number (115766770).

Almost surely, 2^231533539 is an apocalyptic number.

231533539 is a deficient number, since it is larger than the sum of its proper divisors (1).

231533539 is an equidigital number, since it uses as much as digits as its factorization.

231533539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 34.

The square root of 231533539 is about 15216.2261747123. The cubic root of 231533539 is about 614.0512738926.

The spelling of 231533539 in words is "two hundred thirty-one million, five hundred thirty-three thousand, five hundred thirty-nine".