81935223 has 24 divisors (see below), whose sum is σ = 120961008. Its totient is φ = 49158912.

The previous prime is 81935219. The next prime is 81935251. The reversal of 81935223 is 32253918.

It is not a de Polignac number, because 81935223 - 2² = 81935219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25461 + ... + 28497.

It is an arithmetic number, because the mean of its divisors is an integer number (5040042).

Almost surely, 2^81935223 is an apocalyptic number.

81935223 is a deficient number, since it is larger than the sum of its proper divisors (39025785).

81935223 is a wasteful number, since it uses less digits than its factorization.

81935223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3080 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 81935223 is about 9051.8077200082. The cubic root of 81935223 is about 434.3337190589. Note that the first 3 decimals are identical.

It can be divided in two parts, 8193522 and 3, that multiplied together give a triangular number (24580566 = T₇₀₁₁).

The spelling of 81935223 in words is "eighty-one million, nine hundred thirty-five thousand, two hundred twenty-three".