81711122 has 16 divisors (see below), whose sum is σ = 124632960. Its totient is φ = 40171248.

The previous prime is 81711109. The next prime is 81711127. The reversal of 81711122 is 22111718.

It is not an unprimeable number, because it can be changed into a prime (81711127) 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, 42833 + ... + 44699.

It is an arithmetic number, because the mean of its divisors is an integer number (7789560).

Almost surely, 2^81711122 is an apocalyptic number.

81711122 is a deficient number, since it is larger than the sum of its proper divisors (42921838).

81711122 is a wasteful number, since it uses less digits than its factorization.

81711122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225.

The product of its digits is 224, while the sum is 23.

The square root of 81711122 is about 9039.4204460242. The cubic root of 81711122 is about 433.9373754911.

The spelling of 81711122 in words is "eighty-one million, seven hundred eleven thousand, one hundred twenty-two".