253640279 has 2 divisors, whose sum is σ = 253640280. Its totient is φ = 253640278.

The previous prime is 253640267. The next prime is 253640333. The reversal of 253640279 is 972046352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253640279 - 2⁴ = 253640263 is a prime.

It is a super-2 number, since 2×253640279² = 128666782262395682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253640249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126820139 + 126820140.

It is an arithmetic number, because the mean of its divisors is an integer number (126820140).

Almost surely, 2^253640279 is an apocalyptic number.

253640279 is a deficient number, since it is larger than the sum of its proper divisors (1).

253640279 is an equidigital number, since it uses as much as digits as its factorization.

253640279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 253640279 is about 15926.0880005104. The cubic root of 253640279 is about 633.0034457126.

The spelling of 253640279 in words is "two hundred fifty-three million, six hundred forty thousand, two hundred seventy-nine".