81022018 has 16 divisors (see below), whose sum is σ = 151521984. Its totient is φ = 31566960.

The previous prime is 81022013. The next prime is 81022033.

81022018 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a self number, because there is not a number n which added to its sum of digits gives 81022018.

It is not an unprimeable number, because it can be changed into a prime (81022013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262905 + ... + 263212.

It is an arithmetic number, because the mean of its divisors is an integer number (9470124).

Almost surely, 2^81022018 is an apocalyptic number.

81022018 is a deficient number, since it is larger than the sum of its proper divisors (70499966).

81022018 is a wasteful number, since it uses less digits than its factorization.

81022018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526137.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 81022018 is about 9001.2231391073. The cubic root of 81022018 is about 432.7140718010.

The spelling of 81022018 in words is "eighty-one million, twenty-two thousand, eighteen".