3261290491 has 2 divisors, whose sum is σ = 3261290492. Its totient is φ = 3261290490.

The previous prime is 3261290477. The next prime is 3261290509. The reversal of 3261290491 is 1940921623.

It is a weak prime.

It is an emirp because it is prime and its reverse (1940921623) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3261290491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3261290491.

It is not a weakly prime, because it can be changed into another prime (3261296491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630645245 + 1630645246.

It is an arithmetic number, because the mean of its divisors is an integer number (1630645246).

Almost surely, 2^3261290491 is an apocalyptic number.

3261290491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3261290491 is an equidigital number, since it uses as much as digits as its factorization.

3261290491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 3261290491 is about 57107.7095583425. The cubic root of 3261290491 is about 1482.9613355876.

The spelling of 3261290491 in words is "three billion, two hundred sixty-one million, two hundred ninety thousand, four hundred ninety-one".