252121545 has 64 divisors (see below), whose sum is σ = 508166400. Its totient is φ = 117573120.

The previous prime is 252121537. The next prime is 252121567. The reversal of 252121545 is 545121252.

It is not a de Polignac number, because 252121545 - 2³ = 252121537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 29565 + ... + 37125.

It is an arithmetic number, because the mean of its divisors is an integer number (7940100).

Almost surely, 2^252121545 is an apocalyptic number.

It is an amenable number.

252121545 is an abundant number, since it is smaller than the sum of its proper divisors (256044855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

252121545 is a wasteful number, since it uses less digits than its factorization.

252121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7601 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 252121545 is about 15878.3357125361. The cubic root of 252121545 is about 631.7374939628.

Adding to 252121545 its reverse (545121252), we get a palindrome (797242797).

The spelling of 252121545 in words is "two hundred fifty-two million, one hundred twenty-one thousand, five hundred forty-five".