11555210231 has 4 divisors (see below), whose sum is σ = 11584316952. Its totient is φ = 11526103512.

The previous prime is 11555210201. The next prime is 11555210237. The reversal of 11555210231 is 13201255511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13201255511 = 191 ⋅69116521.

It is a cyclic number.

It is not a de Polignac number, because 11555210231 - 2¹⁴ = 11555193847 is a prime.

It is a super-2 number, since 2×11555210231² (a number of 21 digits) contains 22 as substring.

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 11555210231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555210237) 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, 14552765 + ... + 14553558.

It is an arithmetic number, because the mean of its divisors is an integer number (2896079238).

Almost surely, 2^11555210231 is an apocalyptic number.

11555210231 is a deficient number, since it is larger than the sum of its proper divisors (29106721).

11555210231 is an equidigital number, since it uses as much as digits as its factorization.

11555210231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29106720.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 11555210231 its reverse (13201255511), we get a palindrome (24756465742).

The spelling of 11555210231 in words is "eleven billion, five hundred fifty-five million, two hundred ten thousand, two hundred thirty-one".