85391969 has 32 divisors (see below), whose sum is σ = 101445120. Its totient is φ = 71165952.

The previous prime is 85391923. The next prime is 85391983. The reversal of 85391969 is 96919358.

It is not a de Polignac number, because 85391969 - 2²⁴ = 68614753 is a prime.

It is a super-2 number, since 2×85391969² = 14583576739393922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85391989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1080872 + ... + 1080950.

It is an arithmetic number, because the mean of its divisors is an integer number (3170160).

Almost surely, 2^85391969 is an apocalyptic number.

It is an amenable number.

85391969 is a deficient number, since it is larger than the sum of its proper divisors (16053151).

85391969 is a wasteful number, since it uses less digits than its factorization.

85391969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 524880, while the sum is 50.

The square root of 85391969 is about 9240.7775105778. Note that the first 3 decimals coincide. The cubic root of 85391969 is about 440.3577823405.

The spelling of 85391969 in words is "eighty-five million, three hundred ninety-one thousand, nine hundred sixty-nine".