11555550231 has 4 divisors (see below), whose sum is σ = 15407400312. Its totient is φ = 7703700152.

The previous prime is 11555550203. The next prime is 11555550241. The reversal of 11555550231 is 13205555511.

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 11555550231 - 2¹⁰ = 11555549207 is a prime.

It is a super-2 number, since 2×11555550231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11555550192 and 11555550201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555550241) 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, 1925925036 + ... + 1925925041.

It is an arithmetic number, because the mean of its divisors is an integer number (3851850078).

Almost surely, 2^11555550231 is an apocalyptic number.

11555550231 is a deficient number, since it is larger than the sum of its proper divisors (3851850081).

11555550231 is an equidigital number, since it uses as much as digits as its factorization.

11555550231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851850080.

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 11555550231 in words is "eleven billion, five hundred fifty-five million, five hundred fifty thousand, two hundred thirty-one".