11550521531 has 4 divisors (see below), whose sum is σ = 12229963992. Its totient is φ = 10871079072.

The previous prime is 11550521467. The next prime is 11550521551. The reversal of 11550521531 is 13512505511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13512505511 = 52883 ⋅255517.

It is a cyclic number.

It is not a de Polignac number, because 11550521531 - 2⁶ = 11550521467 is a prime.

It is a super-2 number, since 2×11550521531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11550521494 and 11550521503.

It is not an unprimeable number, because it can be changed into a prime (11550521551) 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, 339721205 + ... + 339721238.

It is an arithmetic number, because the mean of its divisors is an integer number (3057490998).

Almost surely, 2^11550521531 is an apocalyptic number.

11550521531 is a deficient number, since it is larger than the sum of its proper divisors (679442461).

11550521531 is an equidigital number, since it uses as much as digits as its factorization.

11550521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679442460.

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 11550521531 in words is "eleven billion, five hundred fifty million, five hundred twenty-one thousand, five hundred thirty-one".