11311262521 has 4 divisors (see below), whose sum is σ = 12181359652. Its totient is φ = 10441165392.

The previous prime is 11311262401. The next prime is 11311262527. The reversal of 11311262521 is 12526211311.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7232652025 + 4078610496 = 85045^2 + 63864^2 .

It is a cyclic number.

It is not a de Polignac number, because 11311262521 - 2¹⁵ = 11311229753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11311262527) 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, 435048546 + ... + 435048571.

It is an arithmetic number, because the mean of its divisors is an integer number (3045339913).

Almost surely, 2^11311262521 is an apocalyptic number.

It is an amenable number.

11311262521 is a deficient number, since it is larger than the sum of its proper divisors (870097131).

11311262521 is an equidigital number, since it uses as much as digits as its factorization.

11311262521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870097130.

The product of its digits is 720, while the sum is 25.

Adding to 11311262521 its reverse (12526211311), we get a palindrome (23837473832).

The spelling of 11311262521 in words is "eleven billion, three hundred eleven million, two hundred sixty-two thousand, five hundred twenty-one".