81142022 has 32 divisors (see below), whose sum is σ = 139732992. Its totient is φ = 35047584.

The previous prime is 81142021. The next prime is 81142031. The reversal of 81142022 is 22024118.

It is a happy number.

81142022 is nontrivially palindromic in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 81141985 and 81142003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81142021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26663 + ... + 29549.

It is an arithmetic number, because the mean of its divisors is an integer number (4366656).

Almost surely, 2^81142022 is an apocalyptic number.

81142022 is a deficient number, since it is larger than the sum of its proper divisors (58590970).

81142022 is a wasteful number, since it uses less digits than its factorization.

81142022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 81142022 is about 9007.8866555924. The cubic root of 81142022 is about 432.9276014266.

The spelling of 81142022 in words is "eighty-one million, one hundred forty-two thousand, twenty-two".