81922234 has 4 divisors (see below), whose sum is σ = 122883354. Its totient is φ = 40961116.

The previous prime is 81922219. The next prime is 81922261. The reversal of 81922234 is 43222918.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53246209 + 28676025 = 7297^2 + 5355^2 .

It is a super-2 number, since 2×81922234² = 13422504847101512, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81922196 and 81922205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20480557 + ... + 20480560.

Almost surely, 2^81922234 is an apocalyptic number.

81922234 is a deficient number, since it is larger than the sum of its proper divisors (40961120).

81922234 is a wasteful number, since it uses less digits than its factorization.

81922234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40961119.

The product of its digits is 6912, while the sum is 31.

The square root of 81922234 is about 9051.0902105768. The cubic root of 81922234 is about 434.3107665418.

The spelling of 81922234 in words is "eighty-one million, nine hundred twenty-two thousand, two hundred thirty-four".