231417561 has 4 divisors (see below), whose sum is σ = 308556752. Its totient is φ = 154278372.

The previous prime is 231417551. The next prime is 231417601. The reversal of 231417561 is 165714132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231417561 - 2²¹ = 229320409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231417541) 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, 38569591 + ... + 38569596.

It is an arithmetic number, because the mean of its divisors is an integer number (77139188).

Almost surely, 2^231417561 is an apocalyptic number.

It is an amenable number.

231417561 is a deficient number, since it is larger than the sum of its proper divisors (77139191).

231417561 is an equidigital number, since it uses as much as digits as its factorization.

231417561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77139190.

The product of its digits is 5040, while the sum is 30.

The square root of 231417561 is about 15212.4146998430. The cubic root of 231417561 is about 613.9487281544.

The spelling of 231417561 in words is "two hundred thirty-one million, four hundred seventeen thousand, five hundred sixty-one".