12355531 has 4 divisors (see below), whose sum is σ = 12892752. Its totient is φ = 11818312.

The previous prime is 12355513. The next prime is 12355543. The reversal of 12355531 is 13555321.

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 12355531 - 2²¹ = 10258379 is a prime.

It is a super-3 number, since 3×12355531³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12355496 and 12355505.

It is not an unprimeable number, because it can be changed into a prime (12355331) 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, 268576 + ... + 268621.

It is an arithmetic number, because the mean of its divisors is an integer number (3223188).

Almost surely, 2^12355531 is an apocalyptic number.

12355531 is a deficient number, since it is larger than the sum of its proper divisors (537221).

12355531 is an equidigital number, since it uses as much as digits as its factorization.

12355531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537220.

The product of its digits is 2250, while the sum is 25.

The square root of 12355531 is about 3515.0435274688. The cubic root of 12355531 is about 231.1818873176.

It can be divided in two parts, 1 and 2355531, that added together give a palindrome (2355532).

The spelling of 12355531 in words is "twelve million, three hundred fifty-five thousand, five hundred thirty-one".