231803531 has 2 divisors, whose sum is σ = 231803532. Its totient is φ = 231803530.

The previous prime is 231803527. The next prime is 231803581. The reversal of 231803531 is 135308132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231803531 - 2² = 231803527 is a prime.

It is a super-2 number, since 2×231803531² = 107465753968135922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231803531.

It is not a weakly prime, because it can be changed into another prime (231803581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115901765 + 115901766.

It is an arithmetic number, because the mean of its divisors is an integer number (115901766).

Almost surely, 2^231803531 is an apocalyptic number.

231803531 is a deficient number, since it is larger than the sum of its proper divisors (1).

231803531 is an equidigital number, since it uses as much as digits as its factorization.

231803531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231803531 is about 15225.0954348405. The cubic root of 231803531 is about 614.2898635610.

The spelling of 231803531 in words is "two hundred thirty-one million, eight hundred three thousand, five hundred thirty-one".