85868181 has 64 divisors (see below), whose sum is σ = 151142400. Its totient is φ = 47764080.

The previous prime is 85868147. The next prime is 85868191. The reversal of 85868181 is 18186858.

It is a happy number.

It is not a de Polignac number, because 85868181 - 2⁶ = 85868117 is a prime.

It is a super-2 number, since 2×85868181² = 14746689016497522, which contains 22 as substring.

Its product of digits (122880) is a multiple of the sum of its prime divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85868141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1086900 + ... + 1086978.

It is an arithmetic number, because the mean of its divisors is an integer number (2361600).

Almost surely, 2^85868181 is an apocalyptic number.

85868181 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

85868181 is a deficient number, since it is larger than the sum of its proper divisors (65274219).

85868181 is an frugal number, since it uses more digits than its factorization.

85868181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 160 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The square root of 85868181 is about 9266.5085657976. The cubic root of 85868181 is about 441.1748577729.

The spelling of 85868181 in words is "eighty-five million, eight hundred sixty-eight thousand, one hundred eighty-one".