8040491 has 2 divisors, whose sum is σ = 8040492. Its totient is φ = 8040490.

The previous prime is 8040481. The next prime is 8040493. The reversal of 8040491 is 1940408.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8040491 is a prime.

It is a Sophie Germain prime.

Together with 8040493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8040491.

It is not a weakly prime, because it can be changed into another prime (8040493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4020245 + 4020246.

It is an arithmetic number, because the mean of its divisors is an integer number (4020246).

Almost surely, 2^8040491 is an apocalyptic number.

8040491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8040491 is an equidigital number, since it uses as much as digits as its factorization.

8040491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8040491 is about 2835.5759556041. The cubic root of 8040491 is about 200.3368573172.

Adding to 8040491 its reverse (1940408), we get a palindrome (9980899).

The spelling of 8040491 in words is "eight million, forty thousand, four hundred ninety-one".