81330922 has 8 divisors (see below), whose sum is σ = 122534496. Its totient is φ = 40486092.

The previous prime is 81330863. The next prime is 81330923. The reversal of 81330922 is 22903318.

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

It is a super-2 number, since 2×81330922² = 13229437746740168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81330923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89118 + ... + 90025.

It is an arithmetic number, because the mean of its divisors is an integer number (15316812).

Almost surely, 2^81330922 is an apocalyptic number.

81330922 is a deficient number, since it is larger than the sum of its proper divisors (41203574).

81330922 is a wasteful number, since it uses less digits than its factorization.

81330922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179372.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 81330922 is about 9018.3658164880. The cubic root of 81330922 is about 433.2632953210.

The spelling of 81330922 in words is "eighty-one million, three hundred thirty thousand, nine hundred twenty-two".