253531561 has 2 divisors, whose sum is σ = 253531562. Its totient is φ = 253531560.

The previous prime is 253531529. The next prime is 253531571. The reversal of 253531561 is 165135352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208975936 + 44555625 = 14456^2 + 6675^2 .

It is a cyclic number.

It is not a de Polignac number, because 253531561 - 2⁵ = 253531529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253531501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126765780 + 126765781.

It is an arithmetic number, because the mean of its divisors is an integer number (126765781).

Almost surely, 2^253531561 is an apocalyptic number.

It is an amenable number.

253531561 is a deficient number, since it is larger than the sum of its proper divisors (1).

253531561 is an equidigital number, since it uses as much as digits as its factorization.

253531561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 31.

The square root of 253531561 is about 15922.6744298814. The cubic root of 253531561 is about 632.9129912261.

The spelling of 253531561 in words is "two hundred fifty-three million, five hundred thirty-one thousand, five hundred sixty-one".