91451812 has 12 divisors (see below), whose sum is σ = 163944396. Its totient is φ = 44610560.

The previous prime is 91451803. The next prime is 91451821. The reversal of 91451812 is 21815419.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (91451803) and next prime (91451821).

It can be written as a sum of positive squares in 2 ways, for example, as 23290276 + 68161536 = 4826^2 + 8256^2 .

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, 278653 + ... + 278980.

It is an arithmetic number, because the mean of its divisors is an integer number (13662033).

Almost surely, 2^91451812 is an apocalyptic number.

It is an amenable number.

91451812 is a deficient number, since it is larger than the sum of its proper divisors (72492584).

91451812 is a wasteful number, since it uses less digits than its factorization.

91451812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557678 (or 557676 counting only the distinct ones).

The product of its digits is 2880, while the sum is 31.

The square root of 91451812 is about 9563.0440760252. The cubic root of 91451812 is about 450.5373202999.

The spelling of 91451812 in words is "ninety-one million, four hundred fifty-one thousand, eight hundred twelve".