252111491 has 2 divisors, whose sum is σ = 252111492. Its totient is φ = 252111490.

The previous prime is 252111473. The next prime is 252111523. The reversal of 252111491 is 194111252.

252111491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252111491 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252111491.

It is not a weakly prime, because it can be changed into another prime (252111401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126055745 + 126055746.

It is an arithmetic number, because the mean of its divisors is an integer number (126055746).

Almost surely, 2^252111491 is an apocalyptic number.

252111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

252111491 is an equidigital number, since it uses as much as digits as its factorization.

252111491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 252111491 is about 15878.0191144865. The cubic root of 252111491 is about 631.7290964613.

The spelling of 252111491 in words is "two hundred fifty-two million, one hundred eleven thousand, four hundred ninety-one".