8091491 has 2 divisors, whose sum is σ = 8091492. Its totient is φ = 8091490.

The previous prime is 8091481. The next prime is 8091509. The reversal of 8091491 is 1941908.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8091491 - 2⁶ = 8091427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8091431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4045745 + 4045746.

It is an arithmetic number, because the mean of its divisors is an integer number (4045746).

Almost surely, 2^8091491 is an apocalyptic number.

8091491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8091491 is an equidigital number, since it uses as much as digits as its factorization.

8091491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 8091491 is about 2844.5546224321. The cubic root of 8091491 is about 200.7595368673.

The spelling of 8091491 in words is "eight million, ninety-one thousand, four hundred ninety-one".