918431 has 2 divisors, whose sum is σ = 918432. Its totient is φ = 918430.

The previous prime is 918397. The next prime is 918433. The reversal of 918431 is 134819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 918431 - 2¹⁰ = 917407 is a prime.

It is a super-4 number, since 4×918431⁴ (a number of 25 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 918433, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 918431.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918431.

It is not a weakly prime, because it can be changed into another prime (918433) 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 as a sum of consecutive naturals, namely, 459215 + 459216.

It is an arithmetic number, because the mean of its divisors is an integer number (459216).

2⁹¹⁸⁴³¹ is an apocalyptic number.

918431 is a deficient number, since it is larger than the sum of its proper divisors (1).

918431 is an equidigital number, since it uses as much as digits as its factorization.

918431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 918431 is about 958.3480578579. The cubic root of 918431 is about 97.2035616007.

The spelling of 918431 in words is "nine hundred eighteen thousand, four hundred thirty-one".