845431 has 2 divisors, whose sum is σ = 845432. Its totient is φ = 845430.

The previous prime is 845387. The next prime is 845441. The reversal of 845431 is 134548.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 845431 - 2⁷ = 845303 is a prime.

It is a super-2 number, since 2×845431² = 1429507151522, which contains 22 as substring.

It is equal to p₆₇₂₉₁ and since 845431 and 67291 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 845396 and 845405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845441) 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, 422715 + 422716.

It is an arithmetic number, because the mean of its divisors is an integer number (422716).

2⁸⁴⁵⁴³¹ is an apocalyptic number.

845431 is a deficient number, since it is larger than the sum of its proper divisors (1).

845431 is an equidigital number, since it uses as much as digits as its factorization.

845431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 845431 is about 919.4732187508. The cubic root of 845431 is about 94.5567905148.

Adding to 845431 its reverse (134548), we get a palindrome (979979).

The spelling of 845431 in words is "eight hundred forty-five thousand, four hundred thirty-one".