85649881 has 4 divisors (see below), whose sum is σ = 85744000. Its totient is φ = 85555764.

The previous prime is 85649873. The next prime is 85649897. The reversal of 85649881 is 18894658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85649881 - 2³ = 85649873 is a prime.

It is a super-2 number, since 2×85649881² = 14671804230628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85649581) 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, 45681 + ... + 47518.

It is an arithmetic number, because the mean of its divisors is an integer number (21436000).

Almost surely, 2^85649881 is an apocalyptic number.

It is an amenable number.

85649881 is a deficient number, since it is larger than the sum of its proper divisors (94119).

85649881 is an equidigital number, since it uses as much as digits as its factorization.

85649881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94118.

The product of its digits is 552960, while the sum is 49.

The square root of 85649881 is about 9254.7220919917. The cubic root of 85649881 is about 440.8006788093.

The spelling of 85649881 in words is "eighty-five million, six hundred forty-nine thousand, eight hundred eighty-one".