252521391 has 16 divisors (see below), whose sum is σ = 343699200. Its totient is φ = 164881728.

The previous prime is 252521389. The next prime is 252521429. The reversal of 252521391 is 193125252.

It is not a de Polignac number, because 252521391 - 2¹ = 252521389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252521491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24150 + ... + 32988.

It is an arithmetic number, because the mean of its divisors is an integer number (21481200).

Almost surely, 2^252521391 is an apocalyptic number.

252521391 is a deficient number, since it is larger than the sum of its proper divisors (91177809).

252521391 is a wasteful number, since it uses less digits than its factorization.

252521391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9038.

The product of its digits is 5400, while the sum is 30.

The square root of 252521391 is about 15890.9216535731. The cubic root of 252521391 is about 632.0712804491.

The spelling of 252521391 in words is "two hundred fifty-two million, five hundred twenty-one thousand, three hundred ninety-one".