252921191 has 4 divisors (see below), whose sum is σ = 254532312. Its totient is φ = 251310072.

The previous prime is 252921167. The next prime is 252921199. The reversal of 252921191 is 191129252.

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

It is a cyclic number.

It is not a de Polignac number, because 252921191 - 2⁶ = 252921127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252921199) 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, 805325 + ... + 805638.

It is an arithmetic number, because the mean of its divisors is an integer number (63633078).

Almost surely, 2^252921191 is an apocalyptic number.

252921191 is a deficient number, since it is larger than the sum of its proper divisors (1611121).

252921191 is a wasteful number, since it uses less digits than its factorization.

252921191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611120.

The product of its digits is 3240, while the sum is 32.

The square root of 252921191 is about 15903.4961879456. The cubic root of 252921191 is about 632.4046764333.

The spelling of 252921191 in words is "two hundred fifty-two million, nine hundred twenty-one thousand, one hundred ninety-one".