291969493 has 2 divisors, whose sum is σ = 291969494. Its totient is φ = 291969492.

The previous prime is 291969481. The next prime is 291969529. The reversal of 291969493 is 394969192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181656484 + 110313009 = 13478^2 + 10503^2 .

It is a cyclic number.

It is not a de Polignac number, because 291969493 - 2⁹ = 291968981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291969493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291969193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145984746 + 145984747.

It is an arithmetic number, because the mean of its divisors is an integer number (145984747).

Almost surely, 2^291969493 is an apocalyptic number.

It is an amenable number.

291969493 is a deficient number, since it is larger than the sum of its proper divisors (1).

291969493 is an equidigital number, since it uses as much as digits as its factorization.

291969493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 52.

The square root of 291969493 is about 17087.1148237495. The cubic root of 291969493 is about 663.4056387489.

The spelling of 291969493 in words is "two hundred ninety-one million, nine hundred sixty-nine thousand, four hundred ninety-three".