231494561 has 2 divisors, whose sum is σ = 231494562. Its totient is φ = 231494560.

The previous prime is 231494509. The next prime is 231494579. The reversal of 231494561 is 165494132.

231494561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 100620961 = 11440^2 + 10031^2 .

It is a cyclic number.

It is not a de Polignac number, because 231494561 - 2²² = 227300257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (231494591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115747280 + 115747281.

It is an arithmetic number, because the mean of its divisors is an integer number (115747281).

Almost surely, 2^231494561 is an apocalyptic number.

It is an amenable number.

231494561 is a deficient number, since it is larger than the sum of its proper divisors (1).

231494561 is an equidigital number, since it uses as much as digits as its factorization.

231494561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 231494561 is about 15214.9453170230. The cubic root of 231494561 is about 614.0168140416.

The spelling of 231494561 in words is "two hundred thirty-one million, four hundred ninety-four thousand, five hundred sixty-one".