4991556407 has 2 divisors, whose sum is σ = 4991556408. Its totient is φ = 4991556406.

The previous prime is 4991556397. The next prime is 4991556413. The reversal of 4991556407 is 7046551994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4991556407 - 2⁴ = 4991556391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991556457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495778203 + 2495778204.

It is an arithmetic number, because the mean of its divisors is an integer number (2495778204).

Almost surely, 2^4991556407 is an apocalyptic number.

4991556407 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991556407 is an equidigital number, since it uses as much as digits as its factorization.

4991556407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 4991556407 is about 70650.9476723419. The cubic root of 4991556407 is about 1709.0128482768.

The spelling of 4991556407 in words is "four billion, nine hundred ninety-one million, five hundred fifty-six thousand, four hundred seven".