85691863 has 2 divisors, whose sum is σ = 85691864. Its totient is φ = 85691862.

The previous prime is 85691821. The next prime is 85691873. The reversal of 85691863 is 36819658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85691863 - 2⁹ = 85691351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85691803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42845931 + 42845932.

It is an arithmetic number, because the mean of its divisors is an integer number (42845932).

Almost surely, 2^85691863 is an apocalyptic number.

85691863 is a deficient number, since it is larger than the sum of its proper divisors (1).

85691863 is an equidigital number, since it uses as much as digits as its factorization.

85691863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 85691863 is about 9256.9899535432. The cubic root of 85691863 is about 440.8726877490.

The spelling of 85691863 in words is "eighty-five million, six hundred ninety-one thousand, eight hundred sixty-three".