91871802329 has 2 divisors, whose sum is σ = 91871802330. Its totient is φ = 91871802328.

The previous prime is 91871802313. The next prime is 91871802403. The reversal of 91871802329 is 92320817819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56406250000 + 35465552329 = 237500^2 + 188323^2 .

It is a cyclic number.

It is not a de Polignac number, because 91871802329 - 2⁴ = 91871802313 is a prime.

It is a super-3 number, since 3×91871802329³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91871802229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45935901164 + 45935901165.

It is an arithmetic number, because the mean of its divisors is an integer number (45935901165).

Almost surely, 2^91871802329 is an apocalyptic number.

It is an amenable number.

91871802329 is a deficient number, since it is larger than the sum of its proper divisors (1).

91871802329 is an equidigital number, since it uses as much as digits as its factorization.

91871802329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 91871802329 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, three hundred twenty-nine".