81814522 has 8 divisors (see below), whose sum is σ = 122827572. Its totient is φ = 40872000.

The previous prime is 81814517. The next prime is 81814529. The reversal of 81814522 is 22541818.

It can be written as a sum of positive squares in 2 ways, for example, as 42889401 + 38925121 = 6549^2 + 6239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81814529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14629 + ... + 19432.

Almost surely, 2^81814522 is an apocalyptic number.

81814522 is a deficient number, since it is larger than the sum of its proper divisors (41013050).

81814522 is a wasteful number, since it uses less digits than its factorization.

81814522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35264.

The product of its digits is 5120, while the sum is 31.

The square root of 81814522 is about 9045.1380310087. The cubic root of 81814522 is about 434.1203379836.

The spelling of 81814522 in words is "eighty-one million, eight hundred fourteen thousand, five hundred twenty-two".