81811322 has 16 divisors (see below), whose sum is σ = 129193920. Its totient is φ = 38778432.

The previous prime is 81811307. The next prime is 81811333. The reversal of 81811322 is 22311818.

It is a junction number, because it is equal to n+sod(n) for n = 81811291 and 81811300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2672 + ... + 13067.

It is an arithmetic number, because the mean of its divisors is an integer number (8074620).

Almost surely, 2^81811322 is an apocalyptic number.

81811322 is a deficient number, since it is larger than the sum of its proper divisors (47382598).

81811322 is a wasteful number, since it uses less digits than its factorization.

81811322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15877.

The product of its digits is 768, while the sum is 26.

The square root of 81811322 is about 9044.9611386672. The cubic root of 81811322 is about 434.1146780137.

The spelling of 81811322 in words is "eighty-one million, eight hundred eleven thousand, three hundred twenty-two".