91000211112 has 24 divisors (see below), whose sum is σ = 246458905290. Its totient is φ = 30333403680.

The previous prime is 91000211039. The next prime is 91000211119. The reversal of 91000211112 is 21111200019.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66684798756 + 24315412356 = 258234^2 + 155934^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (91000211119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 631945839 + ... + 631945982.

Almost surely, 2^91000211112 is an apocalyptic number.

It is an amenable number.

91000211112 is an abundant number, since it is smaller than the sum of its proper divisors (155458694178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91000211112 is a wasteful number, since it uses less digits than its factorization.

91000211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263891833 (or 1263891826 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 91000211112 in words is "ninety-one billion, two hundred eleven thousand, one hundred twelve".