11439431 has 2 divisors, whose sum is σ = 11439432. Its totient is φ = 11439430.

The previous prime is 11439413. The next prime is 11439433. The reversal of 11439431 is 13493411.

Together with previous prime (11439413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13493411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11439431 - 2²² = 7245127 is a prime.

It is a super-2 number, since 2×11439431² = 261721163207522, which contains 22 as substring.

Together with 11439433, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11439431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11439433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5719715 + 5719716.

It is an arithmetic number, because the mean of its divisors is an integer number (5719716).

Almost surely, 2^11439431 is an apocalyptic number.

11439431 is a deficient number, since it is larger than the sum of its proper divisors (1).

11439431 is an equidigital number, since it uses as much as digits as its factorization.

11439431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 11439431 is about 3382.2227898233. Note that the first 3 decimals coincide. The cubic root of 11439431 is about 225.3208984906.

The spelling of 11439431 in words is "eleven million, four hundred thirty-nine thousand, four hundred thirty-one".