991871199359 has 2 divisors, whose sum is σ = 991871199360. Its totient is φ = 991871199358.

The previous prime is 991871199331. The next prime is 991871199383. The reversal of 991871199359 is 953991178199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991871199359 - 2²⁰ = 991870150783 is a prime.

It is a super-2 number, since 2×991871199359² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991871199292 and 991871199301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991871198359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495935599679 + 495935599680.

It is an arithmetic number, because the mean of its divisors is an integer number (495935599680).

Almost surely, 2^991871199359 is an apocalyptic number.

991871199359 is a deficient number, since it is larger than the sum of its proper divisors (1).

991871199359 is an equidigital number, since it uses as much as digits as its factorization.

991871199359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49601160, while the sum is 71.

The spelling of 991871199359 in words is "nine hundred ninety-one billion, eight hundred seventy-one million, one hundred ninety-nine thousand, three hundred fifty-nine".