252799991 has 4 divisors (see below), whose sum is σ = 252936552. Its totient is φ = 252663432.

The previous prime is 252799933. The next prime is 252799993. The reversal of 252799991 is 199997252.

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 252799991 - 2¹⁸ = 252537847 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 (252799993) 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, 65465 + ... + 69218.

It is an arithmetic number, because the mean of its divisors is an integer number (63234138).

Almost surely, 2^252799991 is an apocalyptic number.

252799991 is a deficient number, since it is larger than the sum of its proper divisors (136561).

252799991 is a wasteful number, since it uses less digits than its factorization.

252799991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136560.

The product of its digits is 918540, while the sum is 53.

The square root of 252799991 is about 15899.6852484570. The cubic root of 252799991 is about 632.3036440486.

The spelling of 252799991 in words is "two hundred fifty-two million, seven hundred ninety-nine thousand, nine hundred ninety-one".