81143022 has 32 divisors (see below), whose sum is σ = 165618432. Its totient is φ = 26498304.

The previous prime is 81142973. The next prime is 81143047. The reversal of 81143022 is 22034118.

It is a self number, because there is not a number n which added to its sum of digits gives 81143022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61623 + ... + 62925.

It is an arithmetic number, because the mean of its divisors is an integer number (5175576).

Almost surely, 2^81143022 is an apocalyptic number.

81143022 is an abundant number, since it is smaller than the sum of its proper divisors (84475410).

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

81143022 is a wasteful number, since it uses less digits than its factorization.

81143022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81143022 is about 9007.9421623365. The cubic root of 81143022 is about 432.9293798960.

The spelling of 81143022 in words is "eighty-one million, one hundred forty-three thousand, twenty-two".