81451822 has 8 divisors (see below), whose sum is σ = 128608200. Its totient is φ = 38582424.

The previous prime is 81451819. The next prime is 81451823. The reversal of 81451822 is 22815418.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81451823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071697 + ... + 1071772.

It is an arithmetic number, because the mean of its divisors is an integer number (16076025).

Almost surely, 2^81451822 is an apocalyptic number.

81451822 is a deficient number, since it is larger than the sum of its proper divisors (47156378).

81451822 is a wasteful number, since it uses less digits than its factorization.

81451822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143490.

The product of its digits is 5120, while the sum is 31.

The square root of 81451822 is about 9025.0663155458. The cubic root of 81451822 is about 433.4778738074.

The spelling of 81451822 in words is "eighty-one million, four hundred fifty-one thousand, eight hundred twenty-two".