81322075 has 12 divisors (see below), whose sum is σ = 101486560. Its totient is φ = 64640160.

The previous prime is 81322063. The next prime is 81322097. The reversal of 81322075 is 57022318.

It is not a de Polignac number, because 81322075 - 2¹⁷ = 81191003 is a prime.

It is a super-2 number, since 2×81322075² = 13226559764611250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6435 + ... + 14284.

Almost surely, 2^81322075 is an apocalyptic number.

81322075 is a deficient number, since it is larger than the sum of its proper divisors (20164485).

81322075 is a wasteful number, since it uses less digits than its factorization.

81322075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20886 (or 20881 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 81322075 is about 9017.8753040836. The cubic root of 81322075 is about 433.2475849398.

The spelling of 81322075 in words is "eighty-one million, three hundred twenty-two thousand, seventy-five".