491954399 has 2 divisors, whose sum is σ = 491954400. Its totient is φ = 491954398.

The previous prime is 491954389. The next prime is 491954413. The reversal of 491954399 is 993459194.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491954399 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 491954399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491954339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245977199 + 245977200.

It is an arithmetic number, because the mean of its divisors is an integer number (245977200).

Almost surely, 2^491954399 is an apocalyptic number.

491954399 is a deficient number, since it is larger than the sum of its proper divisors (1).

491954399 is an equidigital number, since it uses as much as digits as its factorization.

491954399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 491954399 is about 22180.0450630742. The cubic root of 491954399 is about 789.4202866606.

The spelling of 491954399 in words is "four hundred ninety-one million, nine hundred fifty-four thousand, three hundred ninety-nine".