235256561 has 2 divisors, whose sum is σ = 235256562. Its totient is φ = 235256560.

The previous prime is 235256531. The next prime is 235256563. The reversal of 235256561 is 165652532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160174336 + 75082225 = 12656^2 + 8665^2 .

It is a cyclic number.

It is not a de Polignac number, because 235256561 - 2²² = 231062257 is a prime.

It is a Sophie Germain prime.

Together with 235256563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (235256563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117628280 + 117628281.

It is an arithmetic number, because the mean of its divisors is an integer number (117628281).

Almost surely, 2^235256561 is an apocalyptic number.

It is an amenable number.

235256561 is a deficient number, since it is larger than the sum of its proper divisors (1).

235256561 is an equidigital number, since it uses as much as digits as its factorization.

235256561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 35.

The square root of 235256561 is about 15338.0755311740. The cubic root of 235256561 is about 617.3250705684.

The spelling of 235256561 in words is "two hundred thirty-five million, two hundred fifty-six thousand, five hundred sixty-one".