85991023 has 4 divisors (see below), whose sum is σ = 86201680. Its totient is φ = 85780368.

The previous prime is 85991021. The next prime is 85991039. The reversal of 85991023 is 32019958.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85991023 - 2¹ = 85991021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85991021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104715 + ... + 105532.

It is an arithmetic number, because the mean of its divisors is an integer number (21550420).

Almost surely, 2^85991023 is an apocalyptic number.

85991023 is a deficient number, since it is larger than the sum of its proper divisors (210657).

85991023 is a wasteful number, since it uses less digits than its factorization.

85991023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210656.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 85991023 is about 9273.1344754619. The cubic root of 85991023 is about 441.3851373677.

The spelling of 85991023 in words is "eighty-five million, nine hundred ninety-one thousand, twenty-three".