81033412 has 18 divisors (see below), whose sum is σ = 143584602. Its totient is φ = 40011264.

The previous prime is 81033409. The next prime is 81033413. The reversal of 81033412 is 21433018.

It can be written as a sum of positive squares in 3 ways, for example, as 39765636 + 41267776 = 6306^2 + 6424^2 .

It is not an unprimeable number, because it can be changed into a prime (81033413) 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, 177088 + ... + 177544.

Almost surely, 2^81033412 is an apocalyptic number.

It is an amenable number.

81033412 is a deficient number, since it is larger than the sum of its proper divisors (62551190).

81033412 is an equidigital number, since it uses as much as digits as its factorization.

81033412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 81033412 is about 9001.8560308416. The cubic root of 81033412 is about 432.7343548186.

The spelling of 81033412 in words is "eighty-one million, thirty-three thousand, four hundred twelve".