855431 has 2 divisors, whose sum is σ = 855432. Its totient is φ = 855430.

The previous prime is 855427. The next prime is 855461. The reversal of 855431 is 134558.

855431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855431 - 2² = 855427 is a prime.

It is a super-2 number, since 2×855431² = 1463524391522, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 855431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427715 + 427716.

It is an arithmetic number, because the mean of its divisors is an integer number (427716).

2⁸⁵⁵⁴³¹ is an apocalyptic number.

855431 is a deficient number, since it is larger than the sum of its proper divisors (1).

855431 is an equidigital number, since it uses as much as digits as its factorization.

855431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 855431 is about 924.8951291903. The cubic root of 855431 is about 94.9281451110.

Adding to 855431 its reverse (134558), we get a palindrome (989989).

The spelling of 855431 in words is "eight hundred fifty-five thousand, four hundred thirty-one".