1290491 has 2 divisors, whose sum is σ = 1290492. Its totient is φ = 1290490.

The previous prime is 1290469. The next prime is 1290503. The reversal of 1290491 is 1940921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1290491 - 2⁶ = 1290427 is a prime.

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 1290491.

It is not a weakly prime, because it can be changed into another prime (1290431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645245 + 645246.

It is an arithmetic number, because the mean of its divisors is an integer number (645246).

2^1290491 is an apocalyptic number.

1290491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290491 is an equidigital number, since it uses as much as digits as its factorization.

1290491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1290491 is about 1135.9977992936. The cubic root of 1290491 is about 108.8725328681.

The spelling of 1290491 in words is "one million, two hundred ninety thousand, four hundred ninety-one".