231684539 has 2 divisors, whose sum is σ = 231684540. Its totient is φ = 231684538.

The previous prime is 231684529. The next prime is 231684547. The reversal of 231684539 is 935486132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231684539 is a prime.

It is a super-2 number, since 2×231684539² = 107355451223285042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231684496 and 231684505.

It is not a weakly prime, because it can be changed into another prime (231684529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115842269 + 115842270.

It is an arithmetic number, because the mean of its divisors is an integer number (115842270).

Almost surely, 2^231684539 is an apocalyptic number.

231684539 is a deficient number, since it is larger than the sum of its proper divisors (1).

231684539 is an equidigital number, since it uses as much as digits as its factorization.

231684539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 231684539 is about 15221.1871744618. The cubic root of 231684539 is about 614.1847341725.

The spelling of 231684539 in words is "two hundred thirty-one million, six hundred eighty-four thousand, five hundred thirty-nine".