91873988343 has 32 divisors (see below), whose sum is σ = 138774820800. Its totient is φ = 60061575168.

The previous prime is 91873988321. The next prime is 91873988347. The reversal of 91873988343 is 34388937819.

91873988343 is a `hidden beast` number, since 9 + 187 + 39 + 88 + 343 = 666.

It is not a de Polignac number, because 91873988343 - 2⁹ = 91873987831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91873988347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124555 + ... + 446387.

It is an arithmetic number, because the mean of its divisors is an integer number (4336713150).

Almost surely, 2^91873988343 is an apocalyptic number.

91873988343 is a deficient number, since it is larger than the sum of its proper divisors (46900832457).

91873988343 is a wasteful number, since it uses less digits than its factorization.

91873988343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322048 (or 322042 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 91873988343 in words is "ninety-one billion, eight hundred seventy-three million, nine hundred eighty-eight thousand, three hundred forty-three".