85897891 has 2 divisors, whose sum is σ = 85897892. Its totient is φ = 85897890.

The previous prime is 85897873. The next prime is 85897901. The reversal of 85897891 is 19879858.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85897891 is a prime.

It is not a weakly prime, because it can be changed into another prime (85897871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42948945 + 42948946.

It is an arithmetic number, because the mean of its divisors is an integer number (42948946).

Almost surely, 2^85897891 is an apocalyptic number.

85897891 is a deficient number, since it is larger than the sum of its proper divisors (1).

85897891 is an equidigital number, since it uses as much as digits as its factorization.

85897891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 55.

The square root of 85897891 is about 9268.1115120611. Note that the first 3 decimals coincide. The cubic root of 85897891 is about 441.2257334037.

The spelling of 85897891 in words is "eighty-five million, eight hundred ninety-seven thousand, eight hundred ninety-one".