11555631 has 12 divisors (see below), whose sum is σ = 17673552. Its totient is φ = 7250496.

The previous prime is 11555611. The next prime is 11555633. The reversal of 11555631 is 13655511.

11555631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11555631 - 2⁹ = 11555119 is a prime.

It is a super-2 number, since 2×11555631² = 267065215616322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11555595 and 11555604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37611 + ... + 37916.

It is an arithmetic number, because the mean of its divisors is an integer number (1472796).

Almost surely, 2^11555631 is an apocalyptic number.

11555631 is a deficient number, since it is larger than the sum of its proper divisors (6117921).

11555631 is a wasteful number, since it uses less digits than its factorization.

11555631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75550 (or 75547 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 11555631 is about 3399.3574392817. The cubic root of 11555631 is about 226.0812548820.

It can be divided in two parts, 1155 and 5631, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 11555631 in words is "eleven million, five hundred fifty-five thousand, six hundred thirty-one".