81222026 has 4 divisors (see below), whose sum is σ = 121833042. Its totient is φ = 40611012.

The previous prime is 81222019. The next prime is 81222059. The reversal of 81222026 is 62022218.

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., 51136801 + 30085225 = 7151^2 + 5485^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81221992 and 81222010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20305505 + ... + 20305508.

Almost surely, 2^81222026 is an apocalyptic number.

81222026 is a deficient number, since it is larger than the sum of its proper divisors (40611016).

81222026 is a wasteful number, since it uses less digits than its factorization.

81222026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40611015.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81222026 is about 9012.3263367457. The cubic root of 81222026 is about 433.0698399437.

The spelling of 81222026 in words is "eighty-one million, two hundred twenty-two thousand, twenty-six".