81922269 has 64 divisors (see below), whose sum is σ = 139345920. Its totient is φ = 42040320.

The previous prime is 81922261. The next prime is 81922273. The reversal of 81922269 is 96222918.

It is not a de Polignac number, because 81922269 - 2³ = 81922261 is a prime.

It is a super-2 number, since 2×81922269² = 13422516316216722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81922261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 342652 + ... + 342890.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^81922269 is an apocalyptic number.

It is an amenable number.

81922269 is a deficient number, since it is larger than the sum of its proper divisors (57423651).

81922269 is a wasteful number, since it uses less digits than its factorization.

81922269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330.

The product of its digits is 31104, while the sum is 39.

The square root of 81922269 is about 9051.0921440454. The cubic root of 81922269 is about 434.3108283926.

The spelling of 81922269 in words is "eighty-one million, nine hundred twenty-two thousand, two hundred sixty-nine".