85351831 has 2 divisors, whose sum is σ = 85351832. Its totient is φ = 85351830.

The previous prime is 85351829. The next prime is 85351841. The reversal of 85351831 is 13815358.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85351831 - 2¹ = 85351829 is a prime.

It is a super-2 number, since 2×85351831² = 14569870110105122, which contains 22 as substring.

Together with 85351829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85351841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42675915 + 42675916.

It is an arithmetic number, because the mean of its divisors is an integer number (42675916).

Almost surely, 2^85351831 is an apocalyptic number.

85351831 is a deficient number, since it is larger than the sum of its proper divisors (1).

85351831 is an equidigital number, since it uses as much as digits as its factorization.

85351831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 85351831 is about 9238.6054683594. The cubic root of 85351831 is about 440.2887756531.

The spelling of 85351831 in words is "eighty-five million, three hundred fifty-one thousand, eight hundred thirty-one".