231005539 has 2 divisors, whose sum is σ = 231005540. Its totient is φ = 231005538.

The previous prime is 231005519. The next prime is 231005609. The reversal of 231005539 is 935500132.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231005539 is a prime.

It is not a weakly prime, because it can be changed into another prime (231005519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115502769 + 115502770.

It is an arithmetic number, because the mean of its divisors is an integer number (115502770).

Almost surely, 2^231005539 is an apocalyptic number.

231005539 is a deficient number, since it is larger than the sum of its proper divisors (1).

231005539 is an equidigital number, since it uses as much as digits as its factorization.

231005539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 231005539 is about 15198.8663722003. The cubic root of 231005539 is about 613.5841481340.

The spelling of 231005539 in words is "two hundred thirty-one million, five thousand, five hundred thirty-nine".