252581257 has 4 divisors (see below), whose sum is σ = 267438996. Its totient is φ = 237723520.

The previous prime is 252581221. The next prime is 252581299. The reversal of 252581257 is 752185252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144504441 + 108076816 = 12021^2 + 10396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252581257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252581207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7428844 + ... + 7428877.

It is an arithmetic number, because the mean of its divisors is an integer number (66859749).

Almost surely, 2^252581257 is an apocalyptic number.

It is an amenable number.

252581257 is a deficient number, since it is larger than the sum of its proper divisors (14857739).

252581257 is a wasteful number, since it uses less digits than its factorization.

252581257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14857738.

The product of its digits is 56000, while the sum is 37.

The square root of 252581257 is about 15892.8051960628. The cubic root of 252581257 is about 632.1212255108.

The spelling of 252581257 in words is "two hundred fifty-two million, five hundred eighty-one thousand, two hundred fifty-seven".