253838861 has 2 divisors, whose sum is σ = 253838862. Its totient is φ = 253838860.

The previous prime is 253838857. The next prime is 253838887. The reversal of 253838861 is 168838352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247432900 + 6405961 = 15730^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 253838861 - 2² = 253838857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253832861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126919430 + 126919431.

It is an arithmetic number, because the mean of its divisors is an integer number (126919431).

Almost surely, 2^253838861 is an apocalyptic number.

It is an amenable number.

253838861 is a deficient number, since it is larger than the sum of its proper divisors (1).

253838861 is an equidigital number, since it uses as much as digits as its factorization.

253838861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 44.

The square root of 253838861 is about 15932.3212684153. The cubic root of 253838861 is about 633.1686012622.

The spelling of 253838861 in words is "two hundred fifty-three million, eight hundred thirty-eight thousand, eight hundred sixty-one".