991000010027 has 2 divisors, whose sum is σ = 991000010028. Its totient is φ = 991000010026.

The previous prime is 991000010003. The next prime is 991000010051. The reversal of 991000010027 is 720010000199.

It is a balanced prime because it is at equal distance from previous prime (991000010003) and next prime (991000010051).

It is a cyclic number.

It is not a de Polignac number, because 991000010027 - 2⁸ = 991000009771 is a prime.

It is not a weakly prime, because it can be changed into another prime (991000010327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495500005013 + 495500005014.

It is an arithmetic number, because the mean of its divisors is an integer number (495500005014).

Almost surely, 2^991000010027 is an apocalyptic number.

991000010027 is a deficient number, since it is larger than the sum of its proper divisors (1).

991000010027 is an equidigital number, since it uses as much as digits as its factorization.

991000010027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The spelling of 991000010027 in words is "nine hundred ninety-one billion, ten thousand, twenty-seven".