253708381 has 2 divisors, whose sum is σ = 253708382. Its totient is φ = 253708380.

The previous prime is 253708373. The next prime is 253708393. The reversal of 253708381 is 183807352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155401156 + 98307225 = 12466^2 + 9915^2 .

It is a cyclic number.

It is not a de Polignac number, because 253708381 - 2³ = 253708373 is a prime.

It is a super-2 number, since 2×253708381² = 128735885179282322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 253708381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253708321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126854190 + 126854191.

It is an arithmetic number, because the mean of its divisors is an integer number (126854191).

Almost surely, 2^253708381 is an apocalyptic number.

It is an amenable number.

253708381 is a deficient number, since it is larger than the sum of its proper divisors (1).

253708381 is an equidigital number, since it uses as much as digits as its factorization.

253708381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 253708381 is about 15928.2259213008. The cubic root of 253708381 is about 633.0600941062.

The spelling of 253708381 in words is "two hundred fifty-three million, seven hundred eight thousand, three hundred eighty-one".