254231561 has 2 divisors, whose sum is σ = 254231562. Its totient is φ = 254231560.

The previous prime is 254231557. The next prime is 254231563. The reversal of 254231561 is 165132452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154231561 + 100000000 = 12419^2 + 10000^2 .

It is a cyclic number.

It is not a de Polignac number, because 254231561 - 2² = 254231557 is a prime.

Together with 254231563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (254231563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127115780 + 127115781.

It is an arithmetic number, because the mean of its divisors is an integer number (127115781).

Almost surely, 2^254231561 is an apocalyptic number.

It is an amenable number.

254231561 is a deficient number, since it is larger than the sum of its proper divisors (1).

254231561 is an equidigital number, since it uses as much as digits as its factorization.

254231561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 254231561 is about 15944.6405102153. The cubic root of 254231561 is about 633.4949463525.

The spelling of 254231561 in words is "two hundred fifty-four million, two hundred thirty-one thousand, five hundred sixty-one".