231305755 has 4 divisors (see below), whose sum is σ = 277566912. Its totient is φ = 185044600.

The previous prime is 231305743. The next prime is 231305797. The reversal of 231305755 is 557503132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231305755 - 2¹¹ = 231303707 is a prime.

It is a super-2 number, since 2×231305755² = 107004704592240050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23130571 + ... + 23130580.

It is an arithmetic number, because the mean of its divisors is an integer number (69391728).

Almost surely, 2^231305755 is an apocalyptic number.

231305755 is a deficient number, since it is larger than the sum of its proper divisors (46261157).

231305755 is an equidigital number, since it uses as much as digits as its factorization.

231305755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46261156.

The product of its (nonzero) digits is 15750, while the sum is 31.

The square root of 231305755 is about 15208.7394283682. The cubic root of 231305755 is about 613.8498387863.

Adding to 231305755 its reverse (557503132), we get a palindrome (788808887).

The spelling of 231305755 in words is "two hundred thirty-one million, three hundred five thousand, seven hundred fifty-five".