81207417 has 8 divisors (see below), whose sum is σ = 109892896. Its totient is φ = 53330112.

The previous prime is 81207407. The next prime is 81207431. The reversal of 81207417 is 71470218.

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

It is not a de Polignac number, because 81207417 - 2⁶ = 81207353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81207407) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 201808 + ... + 202209.

It is an arithmetic number, because the mean of its divisors is an integer number (13736612).

Almost surely, 2^81207417 is an apocalyptic number.

It is an amenable number.

81207417 is a deficient number, since it is larger than the sum of its proper divisors (28685479).

81207417 is a wasteful number, since it uses less digits than its factorization.

81207417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404087.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 81207417 is about 9011.5157992427. The cubic root of 81207417 is about 433.0438736841.

The spelling of 81207417 in words is "eighty-one million, two hundred seven thousand, four hundred seventeen".