81293417 has 4 divisors (see below), whose sum is σ = 81831936. Its totient is φ = 80754900.

The previous prime is 81293413. The next prime is 81293441. The reversal of 81293417 is 71439218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81293417 - 2² = 81293413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81293413) 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, 269033 + ... + 269334.

It is an arithmetic number, because the mean of its divisors is an integer number (20457984).

Almost surely, 2^81293417 is an apocalyptic number.

It is an amenable number.

81293417 is a deficient number, since it is larger than the sum of its proper divisors (538519).

81293417 is a wasteful number, since it uses less digits than its factorization.

81293417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538518.

The product of its digits is 12096, while the sum is 35.

The square root of 81293417 is about 9016.2862088556. The cubic root of 81293417 is about 433.1966866318.

The spelling of 81293417 in words is "eighty-one million, two hundred ninety-three thousand, four hundred seventeen".