4991908447 has 2 divisors, whose sum is σ = 4991908448. Its totient is φ = 4991908446.

The previous prime is 4991908429. The next prime is 4991908457. The reversal of 4991908447 is 7448091994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4991908447 - 2¹¹ = 4991906399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991908457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495954223 + 2495954224.

It is an arithmetic number, because the mean of its divisors is an integer number (2495954224).

Almost surely, 2^4991908447 is an apocalyptic number.

4991908447 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991908447 is an equidigital number, since it uses as much as digits as its factorization.

4991908447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 4991908447 is about 70653.4390316565. The cubic root of 4991908447 is about 1709.0530245726.

The spelling of 4991908447 in words is "four billion, nine hundred ninety-one million, nine hundred eight thousand, four hundred forty-seven".