81111722 has 8 divisors (see below), whose sum is σ = 128071200. Its totient is φ = 38421324.

The previous prime is 81111721. The next prime is 81111757. The reversal of 81111722 is 22711118.

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

It is a super-2 number, since 2×81111722² = 13158222891610568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81111721) 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, 1067222 + ... + 1067297.

It is an arithmetic number, because the mean of its divisors is an integer number (16008900).

Almost surely, 2^81111722 is an apocalyptic number.

81111722 is a deficient number, since it is larger than the sum of its proper divisors (46959478).

81111722 is a wasteful number, since it uses less digits than its factorization.

81111722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134540.

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

The square root of 81111722 is about 9006.2046390253. The cubic root of 81111722 is about 432.8737068717.

The spelling of 81111722 in words is "eighty-one million, one hundred eleven thousand, seven hundred twenty-two".