81425822 has 16 divisors (see below), whose sum is σ = 123984000. Its totient is φ = 40100952.

The previous prime is 81425821. The next prime is 81425831. The reversal of 81425822 is 22852418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81425821) 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, 82343 + ... + 83325.

It is an arithmetic number, because the mean of its divisors is an integer number (7749000).

Almost surely, 2^81425822 is an apocalyptic number.

81425822 is a deficient number, since it is larger than the sum of its proper divisors (42558178).

81425822 is a wasteful number, since it uses less digits than its factorization.

81425822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567.

The product of its digits is 10240, while the sum is 32.

The square root of 81425822 is about 9023.6257679494. The cubic root of 81425822 is about 433.4317458271.

The spelling of 81425822 in words is "eighty-one million, four hundred twenty-five thousand, eight hundred twenty-two".