8135891 has 2 divisors, whose sum is σ = 8135892. Its totient is φ = 8135890.

The previous prime is 8135873. The next prime is 8135899. The reversal of 8135891 is 1985318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8135891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8135899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4067945 + 4067946.

It is an arithmetic number, because the mean of its divisors is an integer number (4067946).

Almost surely, 2^8135891 is an apocalyptic number.

8135891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8135891 is an equidigital number, since it uses as much as digits as its factorization.

8135891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 8135891 is about 2852.3483307619. The cubic root of 8135891 is about 201.1260728999.

The spelling of 8135891 in words is "eight million, one hundred thirty-five thousand, eight hundred ninety-one".