252805557 has 16 divisors (see below), whose sum is σ = 356811840. Its totient is φ = 158938752.

The previous prime is 252805547. The next prime is 252805591. The reversal of 252805557 is 755508252.

It is not a de Polignac number, because 252805557 - 2⁴ = 252805541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252805537) 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 15 ways as a sum of consecutive naturals, for example, 30048 + ... + 37529.

It is an arithmetic number, because the mean of its divisors is an integer number (22300740).

Almost surely, 2^252805557 is an apocalyptic number.

It is an amenable number.

252805557 is a deficient number, since it is larger than the sum of its proper divisors (104006283).

252805557 is a wasteful number, since it uses less digits than its factorization.

252805557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67652.

The product of its (nonzero) digits is 140000, while the sum is 39.

The square root of 252805557 is about 15899.8602824050. The cubic root of 252805557 is about 632.3082845765.

The spelling of 252805557 in words is "two hundred fifty-two million, eight hundred five thousand, five hundred fifty-seven".