11555431 has 8 divisors (see below), whose sum is σ = 11832480. Its totient is φ = 11280672.

The previous prime is 11555387. The next prime is 11555437. The reversal of 11555431 is 13455511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11555431 - 2⁷ = 11555303 is a prime.

It is a super-2 number, since 2×11555431² = 267055971191522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11555396 and 11555405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13525 + ... + 14353.

It is an arithmetic number, because the mean of its divisors is an integer number (1479060).

Almost surely, 2^11555431 is an apocalyptic number.

11555431 is a deficient number, since it is larger than the sum of its proper divisors (277049).

11555431 is an equidigital number, since it uses as much as digits as its factorization.

11555431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145.

The product of its digits is 1500, while the sum is 25.

The square root of 11555431 is about 3399.3280218302. The cubic root of 11555431 is about 226.0799505681.

The spelling of 11555431 in words is "eleven million, five hundred fifty-five thousand, four hundred thirty-one".