81554222 has 8 divisors (see below), whose sum is σ = 122880576. Its totient is φ = 40594032.

The previous prime is 81554203. The next prime is 81554233. The reversal of 81554222 is 22245518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81554222² = 13302182252050568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90983 + ... + 91874.

It is an arithmetic number, because the mean of its divisors is an integer number (15360072).

Almost surely, 2^81554222 is an apocalyptic number.

81554222 is a deficient number, since it is larger than the sum of its proper divisors (41326354).

81554222 is a wasteful number, since it uses less digits than its factorization.

81554222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183082.

The product of its digits is 6400, while the sum is 29.

The square root of 81554222 is about 9030.7376221436. The cubic root of 81554222 is about 433.6594516809.

The spelling of 81554222 in words is "eighty-one million, five hundred fifty-four thousand, two hundred twenty-two".