81122842 has 8 divisors (see below), whose sum is σ = 122459796. Its totient is φ = 40302912.

The previous prime is 81122819. The next prime is 81122869. The reversal of 81122842 is 24822118.

It can be written as a sum of positive squares in 2 ways, for example, as 76055841 + 5067001 = 8721^2 + 2251^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 81122842.

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, 128863 + ... + 129490.

Almost surely, 2^81122842 is an apocalyptic number.

81122842 is a deficient number, since it is larger than the sum of its proper divisors (41336954).

81122842 is a wasteful number, since it uses less digits than its factorization.

81122842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258512.

The product of its digits is 2048, while the sum is 28.

The square root of 81122842 is about 9006.8219700403. The cubic root of 81122842 is about 432.8934875543.

It can be divided in two parts, 811 and 22842, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 81122842 in words is "eighty-one million, one hundred twenty-two thousand, eight hundred forty-two".