253694561 has 2 divisors, whose sum is σ = 253694562. Its totient is φ = 253694560.

The previous prime is 253694549. The next prime is 253694569. The reversal of 253694561 is 165496352.

253694561 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., 252206161 + 1488400 = 15881^2 + 1220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253694561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (253694569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126847280 + 126847281.

It is an arithmetic number, because the mean of its divisors is an integer number (126847281).

Almost surely, 2^253694561 is an apocalyptic number.

It is an amenable number.

253694561 is a deficient number, since it is larger than the sum of its proper divisors (1).

253694561 is an equidigital number, since it uses as much as digits as its factorization.

253694561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The square root of 253694561 is about 15927.7920943237. The cubic root of 253694561 is about 633.0485992167.

The spelling of 253694561 in words is "two hundred fifty-three million, six hundred ninety-four thousand, five hundred sixty-one".