1252541111 has 4 divisors (see below), whose sum is σ = 1255113552. Its totient is φ = 1249968672.

The previous prime is 1252541099. The next prime is 1252541141. The reversal of 1252541111 is 1111452521.

It is a happy number.

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 1252541111 - 2¹⁴ = 1252524727 is a prime.

It is a super-2 number, since 2×1252541111² = 3137718469490228642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252541141) 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, 1285490 + ... + 1286463.

It is an arithmetic number, because the mean of its divisors is an integer number (313778388).

Almost surely, 2^1252541111 is an apocalyptic number.

1252541111 is a deficient number, since it is larger than the sum of its proper divisors (2572441).

1252541111 is an equidigital number, since it uses as much as digits as its factorization.

1252541111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572440.

The product of its digits is 400, while the sum is 23.

The square root of 1252541111 is about 35391.2575504177. The cubic root of 1252541111 is about 1077.9468052938.

Adding to 1252541111 its reverse (1111452521), we get a palindrome (2363993632).

The spelling of 1252541111 in words is "one billion, two hundred fifty-two million, five hundred forty-one thousand, one hundred eleven".