231659081 has 4 divisors (see below), whose sum is σ = 232620564. Its totient is φ = 230697600.

The previous prime is 231659069. The next prime is 231659083. The reversal of 231659081 is 180956132.

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 212693056 + 18966025 = 14584^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 231659081 - 2¹⁰ = 231658057 is a prime.

It is a super-2 number, since 2×231659081² = 107331859619529122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231659083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480380 + ... + 480861.

It is an arithmetic number, because the mean of its divisors is an integer number (58155141).

Almost surely, 2^231659081 is an apocalyptic number.

It is an amenable number.

231659081 is a deficient number, since it is larger than the sum of its proper divisors (961483).

231659081 is an equidigital number, since it uses as much as digits as its factorization.

231659081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961482.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 231659081 is about 15220.3508829462. The cubic root of 231659081 is about 614.1622373646.

The spelling of 231659081 in words is "two hundred thirty-one million, six hundred fifty-nine thousand, eighty-one".