11321511531 has 24 divisors (see below), whose sum is σ = 16599900240. Its totient is φ = 6858424320.

The previous prime is 11321511529. The next prime is 11321511577. The reversal of 11321511531 is 13511512311.

It is not a de Polignac number, because 11321511531 - 2¹ = 11321511529 is a prime.

It is a super-2 number, since 2×11321511531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11321511511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 993675 + ... + 1005003.

It is an arithmetic number, because the mean of its divisors is an integer number (691662510).

Almost surely, 2^11321511531 is an apocalyptic number.

11321511531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11321511531 is a deficient number, since it is larger than the sum of its proper divisors (5278388709).

11321511531 is a wasteful number, since it uses less digits than its factorization.

11321511531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14107 (or 14096 counting only the distinct ones).

The product of its digits is 450, while the sum is 24.

The spelling of 11321511531 in words is "eleven billion, three hundred twenty-one million, five hundred eleven thousand, five hundred thirty-one".