1252511011 has 4 divisors (see below), whose sum is σ = 1292914624. Its totient is φ = 1212107400.

The previous prime is 1252510991. The next prime is 1252511033. The reversal of 1252511011 is 1101152521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101152521 = 7 ⋅157307503.

It is a cyclic number.

It is not a de Polignac number, because 1252511011 - 2⁵ = 1252510979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252511011.

It is not an unprimeable number, because it can be changed into a prime (1252511111) 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, 20201760 + ... + 20201821.

It is an arithmetic number, because the mean of its divisors is an integer number (323228656).

Almost surely, 2^1252511011 is an apocalyptic number.

1252511011 is a deficient number, since it is larger than the sum of its proper divisors (40403613).

1252511011 is an equidigital number, since it uses as much as digits as its factorization.

1252511011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40403612.

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

The square root of 1252511011 is about 35390.8323016004. The cubic root of 1252511011 is about 1077.9381704584.

Adding to 1252511011 its reverse (1101152521), we get a palindrome (2353663532).

The spelling of 1252511011 in words is "one billion, two hundred fifty-two million, five hundred eleven thousand, eleven".