1252551111 has 16 divisors (see below), whose sum is σ = 1909146624. Its totient is φ = 715557024.

The previous prime is 1252551073. The next prime is 1252551149. The reversal of 1252551111 is 1111552521.

It is an interprime number because it is at equal distance from previous prime (1252551073) and next prime (1252551149).

It is not a de Polignac number, because 1252551111 - 2¹⁰ = 1252550087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252551161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140946 + ... + 149568.

It is an arithmetic number, because the mean of its divisors is an integer number (119321664).

Almost surely, 2^1252551111 is an apocalyptic number.

1252551111 is a deficient number, since it is larger than the sum of its proper divisors (656595513).

1252551111 is an equidigital number, since it uses as much as digits as its factorization.

1252551111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550.

The product of its digits is 500, while the sum is 24.

The square root of 1252551111 is about 35391.3988279638. The cubic root of 1252551111 is about 1077.9496739792.

It can be divided in two parts, 12525 and 51111, that added together give a palindrome (63636).

The spelling of 1252551111 in words is "one billion, two hundred fifty-two million, five hundred fifty-one thousand, one hundred eleven".