8557091 has 2 divisors, whose sum is σ = 8557092. Its totient is φ = 8557090.

The previous prime is 8557079. The next prime is 8557093. The reversal of 8557091 is 1907558.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8557091 is a prime.

Together with 8557093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8557093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278545 + 4278546.

It is an arithmetic number, because the mean of its divisors is an integer number (4278546).

Almost surely, 2^8557091 is an apocalyptic number.

8557091 is a deficient number, since it is larger than the sum of its proper divisors (1).

8557091 is an equidigital number, since it uses as much as digits as its factorization.

8557091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 8557091 is about 2925.2505875566. The cubic root of 8557091 is about 204.5386492072.

The spelling of 8557091 in words is "eight million, five hundred fifty-seven thousand, ninety-one".