91043812 has 24 divisors (see below), whose sum is σ = 161635320. Its totient is φ = 44866560.

The previous prime is 91043803. The next prime is 91043819. The reversal of 91043812 is 21834019.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16842816 + 74200996 = 4104^2 + 8614^2 .

It is not an unprimeable number, because it can be changed into a prime (91043819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178614 + ... + 179122.

It is an arithmetic number, because the mean of its divisors is an integer number (6734805).

Almost surely, 2^91043812 is an apocalyptic number.

It is an amenable number.

91043812 is a deficient number, since it is larger than the sum of its proper divisors (70591508).

91043812 is a wasteful number, since it uses less digits than its factorization.

91043812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071 (or 1069 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 91043812 is about 9541.6881106018. The cubic root of 91043812 is about 449.8663174922.

The spelling of 91043812 in words is "ninety-one million, forty-three thousand, eight hundred twelve".