85969181 has 4 divisors (see below), whose sum is σ = 85992252. Its totient is φ = 85946112.

The previous prime is 85969141. The next prime is 85969183. The reversal of 85969181 is 18196958.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80371225 + 5597956 = 8965^2 + 2366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85969181 is a prime.

It is a super-2 number, since 2×85969181² = 14781400163621522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85969183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4526 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (21498063).

Almost surely, 2^85969181 is an apocalyptic number.

It is an amenable number.

85969181 is a deficient number, since it is larger than the sum of its proper divisors (23071).

85969181 is a wasteful number, since it uses less digits than its factorization.

85969181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23070.

The product of its digits is 155520, while the sum is 47.

The square root of 85969181 is about 9271.9566974830. The cubic root of 85969181 is about 441.3477631155.

The spelling of 85969181 in words is "eighty-five million, nine hundred sixty-nine thousand, one hundred eighty-one".