91871802375 has 16 divisors (see below), whose sum is σ = 152874679776. Its totient is φ = 48998294400.

The previous prime is 91871802329. The next prime is 91871802403. The reversal of 91871802375 is 57320817819.

It is not a de Polignac number, because 91871802375 - 2¹⁵ = 91871769607 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122495362 + ... + 122496111.

It is an arithmetic number, because the mean of its divisors is an integer number (9554667486).

Almost surely, 2^91871802375 is an apocalyptic number.

91871802375 is a deficient number, since it is larger than the sum of its proper divisors (61002877401).

91871802375 is a wasteful number, since it uses less digits than its factorization.

91871802375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244991491 (or 244991481 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 91871802375 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, three hundred seventy-five".