85869511 has 24 divisors (see below), whose sum is σ = 112269024. Its totient is φ = 64975680.

The previous prime is 85869503. The next prime is 85869521. The reversal of 85869511 is 11596858.

It is not a de Polignac number, because 85869511 - 2³ = 85869503 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85869521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11721 + ... + 17581.

It is an arithmetic number, because the mean of its divisors is an integer number (4677876).

Almost surely, 2^85869511 is an apocalyptic number.

85869511 is the 5861-st heptagonal number.

85869511 is a deficient number, since it is larger than the sum of its proper divisors (26399513).

85869511 is a wasteful number, since it uses less digits than its factorization.

85869511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911 (or 5904 counting only the distinct ones).

The product of its digits is 86400, while the sum is 43.

The square root of 85869511 is about 9266.5803293340. The cubic root of 85869511 is about 441.1771355260.

The spelling of 85869511 in words is "eighty-five million, eight hundred sixty-nine thousand, five hundred eleven".