85807031 has 2 divisors, whose sum is σ = 85807032. Its totient is φ = 85807030.

The previous prime is 85806989. The next prime is 85807049. The reversal of 85807031 is 13070858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85807031 - 2¹⁸ = 85544887 is a prime.

It is a super-2 number, since 2×85807031² = 14725693138069922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85807061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42903515 + 42903516.

It is an arithmetic number, because the mean of its divisors is an integer number (42903516).

Almost surely, 2^85807031 is an apocalyptic number.

85807031 is a deficient number, since it is larger than the sum of its proper divisors (1).

85807031 is an equidigital number, since it uses as much as digits as its factorization.

85807031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 85807031 is about 9263.2084614349. The cubic root of 85807031 is about 441.0701071006.

Adding to 85807031 its reverse (13070858), we get a palindrome (98877889).

The spelling of 85807031 in words is "eighty-five million, eight hundred seven thousand, thirty-one".