231089905 has 4 divisors (see below), whose sum is σ = 277307892. Its totient is φ = 184871920.

The previous prime is 231089897. The next prime is 231089917. The reversal of 231089905 is 509980132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129140496 + 101949409 = 11364^2 + 10097^2 .

It is not a de Polignac number, because 231089905 - 2³ = 231089897 is a prime.

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, 23108986 + ... + 23108995.

It is an arithmetic number, because the mean of its divisors is an integer number (69326973).

Almost surely, 2^231089905 is an apocalyptic number.

It is an amenable number.

231089905 is a deficient number, since it is larger than the sum of its proper divisors (46217987).

231089905 is an equidigital number, since it uses as much as digits as its factorization.

231089905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46217986.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 231089905 is about 15201.6415232040. The cubic root of 231089905 is about 613.6588351450.

The spelling of 231089905 in words is "two hundred thirty-one million, eighty-nine thousand, nine hundred five".