252111511 has 4 divisors (see below), whose sum is σ = 252397912. Its totient is φ = 251825112.

The previous prime is 252111491. The next prime is 252111523. The reversal of 252111511 is 115111252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252111511 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 (252111311) 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, 141876 + ... + 143641.

It is an arithmetic number, because the mean of its divisors is an integer number (63099478).

Almost surely, 2^252111511 is an apocalyptic number.

252111511 is a deficient number, since it is larger than the sum of its proper divisors (286401).

252111511 is an equidigital number, since it uses as much as digits as its factorization.

252111511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286400.

The product of its digits is 100, while the sum is 19.

The square root of 252111511 is about 15878.0197442880. The cubic root of 252111511 is about 631.7291131663.

Adding to 252111511 its reverse (115111252), we get a palindrome (367222763).

The spelling of 252111511 in words is "two hundred fifty-two million, one hundred eleven thousand, five hundred eleven".