991019747 has 2 divisors, whose sum is σ = 991019748. Its totient is φ = 991019746.

The previous prime is 991019741. The next prime is 991019759. The reversal of 991019747 is 747910199.

991019747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991019747 - 2²² = 986825443 is a prime.

It is not a weakly prime, because it can be changed into another prime (991019741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495509873 + 495509874.

It is an arithmetic number, because the mean of its divisors is an integer number (495509874).

Almost surely, 2^991019747 is an apocalyptic number.

991019747 is a deficient number, since it is larger than the sum of its proper divisors (1).

991019747 is an equidigital number, since it uses as much as digits as its factorization.

991019747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 991019747 is about 31480.4661178960. The cubic root of 991019747 is about 996.9975768101.

The spelling of 991019747 in words is "nine hundred ninety-one million, nineteen thousand, seven hundred forty-seven".