91871802231 has 16 divisors (see below), whose sum is σ = 133642299648. Its totient is φ = 55675468800.

The previous prime is 91871802229. The next prime is 91871802241. The reversal of 91871802231 is 13220817819.

It is not a de Polignac number, because 91871802231 - 2¹ = 91871802229 is a prime.

It is a super-3 number, since 3×91871802231³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91871802221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339990 + ... + 547116.

It is an arithmetic number, because the mean of its divisors is an integer number (8352643728).

Almost surely, 2^91871802231 is an apocalyptic number.

91871802231 is a deficient number, since it is larger than the sum of its proper divisors (41770497417).

91871802231 is a wasteful number, since it uses less digits than its factorization.

91871802231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220582.

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 91871802231 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred two thousand, two hundred thirty-one".