81922771 has 8 divisors (see below), whose sum is σ = 93685760. Its totient is φ = 70174728.

The previous prime is 81922769. The next prime is 81922777. The reversal of 81922771 is 17722918.

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

It is a cyclic number.

It is not a de Polignac number, because 81922771 - 2¹ = 81922769 is a prime.

It is a super-2 number, since 2×81922771² = 13422680816636882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81922771.

It is not an unprimeable number, because it can be changed into a prime (81922777) 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, 13060 + ... + 18286.

It is an arithmetic number, because the mean of its divisors is an integer number (11710720).

Almost surely, 2^81922771 is an apocalyptic number.

81922771 is a deficient number, since it is larger than the sum of its proper divisors (11762989).

81922771 is a wasteful number, since it uses less digits than its factorization.

81922771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473.

The product of its digits is 14112, while the sum is 37.

The square root of 81922771 is about 9051.1198754629. The cubic root of 81922771 is about 434.3117155083.

The spelling of 81922771 in words is "eighty-one million, nine hundred twenty-two thousand, seven hundred seventy-one".