11155431 has 16 divisors (see below), whose sum is σ = 17049600. Its totient is φ = 6355488.

The previous prime is 11155423. The next prime is 11155453. The reversal of 11155431 is 13455111.

It is a happy number.

It is not a de Polignac number, because 11155431 - 2³ = 11155423 is a prime.

It is a super-2 number, since 2×11155431² = 248887281591522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 11155398 and 11155407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11155411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9505 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (1065600).

Almost surely, 2^11155431 is an apocalyptic number.

11155431 is a deficient number, since it is larger than the sum of its proper divisors (5894169).

11155431 is a wasteful number, since it uses less digits than its factorization.

11155431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598.

The product of its digits is 300, while the sum is 21.

The square root of 11155431 is about 3339.9747005030. The cubic root of 11155431 is about 223.4406150250.

The spelling of 11155431 in words is "eleven million, one hundred fifty-five thousand, four hundred thirty-one".