91871802229 has 2 divisors, whose sum is σ = 91871802230. Its totient is φ = 91871802228.

The previous prime is 91871802221. The next prime is 91871802241. The reversal of 91871802229 is 92220817819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91863548100 + 8254129 = 303090^2 + 2873^2 .

It is a cyclic number.

It is not a de Polignac number, because 91871802229 - 2³ = 91871802221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91871802221) 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, 45935901114 + 45935901115.

It is an arithmetic number, because the mean of its divisors is an integer number (45935901115).

Almost surely, 2^91871802229 is an apocalyptic number.

It is an amenable number.

91871802229 is a deficient number, since it is larger than the sum of its proper divisors (1).

91871802229 is an equidigital number, since it uses as much as digits as its factorization.

91871802229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 91871802229 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, two hundred twenty-nine".