253647257 has 4 divisors (see below), whose sum is σ = 253681716. Its totient is φ = 253612800.

The previous prime is 253647167. The next prime is 253647269. The reversal of 253647257 is 752746352.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 90421081 + 163226176 = 9509^2 + 12776^2 .

It is a cyclic number.

It is not a de Polignac number, because 253647257 - 2¹⁰ = 253646233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253647857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244 + ... + 22557.

It is an arithmetic number, because the mean of its divisors is an integer number (63420429).

Almost surely, 2^253647257 is an apocalyptic number.

It is an amenable number.

253647257 is a deficient number, since it is larger than the sum of its proper divisors (34459).

253647257 is a wasteful number, since it uses less digits than its factorization.

253647257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34458.

The product of its digits is 352800, while the sum is 41.

The square root of 253647257 is about 15926.3070735183. The cubic root of 253647257 is about 633.0092505971.

The spelling of 253647257 in words is "two hundred fifty-three million, six hundred forty-seven thousand, two hundred fifty-seven".