991000010327 has 2 divisors, whose sum is σ = 991000010328. Its totient is φ = 991000010326.

The previous prime is 991000010317. The next prime is 991000010443. The reversal of 991000010327 is 723010000199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991000010327 - 2¹⁴ = 990999993943 is a prime.

It is a super-2 number, since 2×991000010327² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991000010293 and 991000010302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991000010317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495500005163 + 495500005164.

It is an arithmetic number, because the mean of its divisors is an integer number (495500005164).

Almost surely, 2^991000010327 is an apocalyptic number.

991000010327 is a deficient number, since it is larger than the sum of its proper divisors (1).

991000010327 is an equidigital number, since it uses as much as digits as its factorization.

991000010327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The spelling of 991000010327 in words is "nine hundred ninety-one billion, ten thousand, three hundred twenty-seven".