855534431 has 2 divisors, whose sum is σ = 855534432. Its totient is φ = 855534430.

The previous prime is 855534391. The next prime is 855534517. The reversal of 855534431 is 134435558.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855534431 - 2¹⁸ = 855272287 is a prime.

It is a super-2 number, since 2×855534431² = 1463878325252987522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855534131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427767215 + 427767216.

It is an arithmetic number, because the mean of its divisors is an integer number (427767216).

Almost surely, 2^855534431 is an apocalyptic number.

855534431 is a deficient number, since it is larger than the sum of its proper divisors (1).

855534431 is an equidigital number, since it uses as much as digits as its factorization.

855534431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 38.

The square root of 855534431 is about 29249.5201840987. The cubic root of 855534431 is about 949.3197090848.

Adding to 855534431 its reverse (134435558), we get a palindrome (989969989).

The spelling of 855534431 in words is "eight hundred fifty-five million, five hundred thirty-four thousand, four hundred thirty-one".