91831277212 has 12 divisors (see below), whose sum is σ = 170157954960. Its totient is φ = 43214718656.

The previous prime is 91831277201. The next prime is 91831277227. The reversal of 91831277212 is 21277213819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675229912 + ... + 675230047.

It is an arithmetic number, because the mean of its divisors is an integer number (14179829580).

Almost surely, 2^91831277212 is an apocalyptic number.

It is an amenable number.

91831277212 is a deficient number, since it is larger than the sum of its proper divisors (78326677748).

91831277212 is a wasteful number, since it uses less digits than its factorization.

91831277212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350459980 (or 1350459978 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The spelling of 91831277212 in words is "ninety-one billion, eight hundred thirty-one million, two hundred seventy-seven thousand, two hundred twelve".