81571226 has 16 divisors (see below), whose sum is σ = 136321920. Its totient is φ = 36288480.

The previous prime is 81571183. The next prime is 81571247. The reversal of 81571226 is 62217518.

It is a super-2 number, since 2×81571226² = 13307729822286152, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81571192 and 81571201.

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, 38411 + ... + 40478.

It is an arithmetic number, because the mean of its divisors is an integer number (8520120).

Almost surely, 2^81571226 is an apocalyptic number.

81571226 is a deficient number, since it is larger than the sum of its proper divisors (54750694).

81571226 is a wasteful number, since it uses less digits than its factorization.

81571226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78949.

The product of its digits is 6720, while the sum is 32.

The square root of 81571226 is about 9031.6790244118. The cubic root of 81571226 is about 433.6895888204.

The spelling of 81571226 in words is "eighty-one million, five hundred seventy-one thousand, two hundred twenty-six".