89857891 has 2 divisors, whose sum is σ = 89857892. Its totient is φ = 89857890.

The previous prime is 89857861. The next prime is 89857907. The reversal of 89857891 is 19875898.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89857891 - 2⁷ = 89857763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89857811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44928945 + 44928946.

It is an arithmetic number, because the mean of its divisors is an integer number (44928946).

Almost surely, 2^89857891 is an apocalyptic number.

89857891 is a deficient number, since it is larger than the sum of its proper divisors (1).

89857891 is an equidigital number, since it uses as much as digits as its factorization.

89857891 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 89857891 is about 9479.3402196566. The cubic root of 89857891 is about 447.9044807915.

The spelling of 89857891 in words is "eighty-nine million, eight hundred fifty-seven thousand, eight hundred ninety-one".