85461891 has 4 divisors (see below), whose sum is σ = 113949192. Its totient is φ = 56974592.

The previous prime is 85461889. The next prime is 85461899. The reversal of 85461891 is 19816458.

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

It is a cyclic number.

It is not a de Polignac number, because 85461891 - 2¹ = 85461889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85461899) 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, 14243646 + ... + 14243651.

It is an arithmetic number, because the mean of its divisors is an integer number (28487298).

Almost surely, 2^85461891 is an apocalyptic number.

85461891 is a deficient number, since it is larger than the sum of its proper divisors (28487301).

85461891 is a wasteful number, since it uses less digits than its factorization.

85461891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28487300.

The product of its digits is 69120, while the sum is 42.

The square root of 85461891 is about 9244.5600760664. The cubic root of 85461891 is about 440.4779431193.

The spelling of 85461891 in words is "eighty-five million, four hundred sixty-one thousand, eight hundred ninety-one".