91871802373 has 32 divisors (see below), whose sum is σ = 105369919200. Its totient is φ = 79351750656.

The previous prime is 91871802329. The next prime is 91871802403. The reversal of 91871802373 is 37320817819.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 29180155684 + 62691646689 = 170822^2 + 250383^2 .

It is a cyclic number.

It is not a de Polignac number, because 91871802373 - 2¹³ = 91871794181 is a prime.

It is a super-2 number, since 2×91871802373² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91871802313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55045183 + ... + 55046851.

It is an arithmetic number, because the mean of its divisors is an integer number (3292809975).

Almost surely, 2^91871802373 is an apocalyptic number.

It is an amenable number.

91871802373 is a deficient number, since it is larger than the sum of its proper divisors (13498116827).

91871802373 is a wasteful number, since it uses less digits than its factorization.

91871802373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 91871802373 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, three hundred seventy-three".