81110224 has 20 divisors (see below), whose sum is σ = 169240036. Its totient is φ = 37435392.

The previous prime is 81110207. The next prime is 81110231. The reversal of 81110224 is 42201118.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14197824 + 66912400 = 3768^2 + 8180^2 .

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, 194769 + ... + 195184.

Almost surely, 2^81110224 is an apocalyptic number.

It is an amenable number.

81110224 is an abundant number, since it is smaller than the sum of its proper divisors (88129812).

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

81110224 is a wasteful number, since it uses less digits than its factorization.

81110224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389974 (or 389968 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 81110224 is about 9006.1214737533. The cubic root of 81110224 is about 432.8710420337.

It can be divided in two parts, 81 and 110224, that multiplied together give a square (8928144 = 2988²).

The spelling of 81110224 in words is "eighty-one million, one hundred ten thousand, two hundred twenty-four".