11166431 has 4 divisors (see below), whose sum is σ = 11651952. Its totient is φ = 10680912.

The previous prime is 11166427. The next prime is 11166439. The reversal of 11166431 is 13466111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13466111 = 47 ⋅286513.

It is a cyclic number.

It is not a de Polignac number, because 11166431 - 2² = 11166427 is a prime.

It is a super-2 number, since 2×11166431² = 249378362555522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 485497 = 11166431 / (1 + 1 + 1 + 6 + 6 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11166397 and 11166406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11166439) 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, 242726 + ... + 242771.

It is an arithmetic number, because the mean of its divisors is an integer number (2912988).

Almost surely, 2^11166431 is an apocalyptic number.

11166431 is a deficient number, since it is larger than the sum of its proper divisors (485521).

11166431 is an equidigital number, since it uses as much as digits as its factorization.

11166431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485520.

The product of its digits is 432, while the sum is 23.

The square root of 11166431 is about 3341.6210138195. The cubic root of 11166431 is about 223.5140333549.

It can be divided in two parts, 11 and 166431, that multiplied together give a triangular number (1830741 = T₁₉₁₃).

The spelling of 11166431 in words is "eleven million, one hundred sixty-six thousand, four hundred thirty-one".