81922671 has 10 divisors (see below), whose sum is σ = 122378432. Its totient is φ = 54615060.

The previous prime is 81922667. The next prime is 81922679. The reversal of 81922671 is 17622918.

It is not a de Polignac number, because 81922671 - 2² = 81922667 is a prime.

It is a super-2 number, since 2×81922671² = 13422648047548482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81922679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 505615 + ... + 505776.

Almost surely, 2^81922671 is an apocalyptic number.

81922671 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

81922671 is a deficient number, since it is larger than the sum of its proper divisors (40455761).

81922671 is a wasteful number, since it uses less digits than its factorization.

81922671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011403 (or 1011394 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 81922671 is about 9051.1143512829. The cubic root of 81922671 is about 434.3115387923.

The spelling of 81922671 in words is "eighty-one million, nine hundred twenty-two thousand, six hundred seventy-one".