81194022 has 192 divisors, whose sum is σ = 236113920. Its totient is φ = 20217600.

The previous prime is 81193999. The next prime is 81194027. The reversal of 81194022 is 22049118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81194027) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1980322 + ... + 1980362.

It is an arithmetic number, because the mean of its divisors is an integer number (1229760).

Almost surely, 2^81194022 is an apocalyptic number.

81194022 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 81194022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118056960).

81194022 is an abundant number, since it is smaller than the sum of its proper divisors (154919898).

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

81194022 is a wasteful number, since it uses less digits than its factorization.

81194022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 81194022 is about 9010.7725528947. The cubic root of 81194022 is about 433.0200624697.

The spelling of 81194022 in words is "eighty-one million, one hundred ninety-four thousand, twenty-two".