81322617 has 8 divisors (see below), whose sum is σ = 110476224. Its totient is φ = 53192048.

The previous prime is 81322613. The next prime is 81322651. The reversal of 81322617 is 71622318.

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

It is a cyclic number.

It is not a de Polignac number, because 81322617 - 2² = 81322613 is a prime.

It is a super-2 number, since 2×81322617² = 13226736071457378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81322613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255573 + ... + 255890.

It is an arithmetic number, because the mean of its divisors is an integer number (13809528).

Almost surely, 2^81322617 is an apocalyptic number.

It is an amenable number.

81322617 is a deficient number, since it is larger than the sum of its proper divisors (29153607).

81322617 is a wasteful number, since it uses less digits than its factorization.

81322617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511519.

The product of its digits is 4032, while the sum is 30.

The square root of 81322617 is about 9017.9053554581. The cubic root of 81322617 is about 433.2485474487.

The spelling of 81322617 in words is "eighty-one million, three hundred twenty-two thousand, six hundred seventeen".