81413222 has 8 divisors (see below), whose sum is σ = 133221672. Its totient is φ = 37006000.

The previous prime is 81413219. The next prime is 81413303. The reversal of 81413222 is 22231418.

It is a happy number.

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

It is a super-2 number, since 2×81413222² = 13256225432842568, 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, 1850279 + ... + 1850322.

It is an arithmetic number, because the mean of its divisors is an integer number (16652709).

Almost surely, 2^81413222 is an apocalyptic number.

81413222 is a deficient number, since it is larger than the sum of its proper divisors (51808450).

81413222 is a wasteful number, since it uses less digits than its factorization.

81413222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700614.

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

The square root of 81413222 is about 9022.9275736869. The cubic root of 81413222 is about 433.4093879657.

The spelling of 81413222 in words is "eighty-one million, four hundred thirteen thousand, two hundred twenty-two".