81413417 has 4 divisors (see below), whose sum is σ = 81443076. Its totient is φ = 81383760.

The previous prime is 81413407. The next prime is 81413419. The reversal of 81413417 is 71431418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75672601 + 5740816 = 8699^2 + 2396^2 .

It is a cyclic number.

It is not a de Polignac number, because 81413417 - 2¹⁴ = 81397033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81413417.

It is not an unprimeable number, because it can be changed into a prime (81413419) 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, 10238 + ... + 16359.

It is an arithmetic number, because the mean of its divisors is an integer number (20360769).

Almost surely, 2^81413417 is an apocalyptic number.

It is an amenable number.

81413417 is a deficient number, since it is larger than the sum of its proper divisors (29659).

81413417 is a wasteful number, since it uses less digits than its factorization.

81413417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29658.

The product of its digits is 2688, while the sum is 29.

The square root of 81413417 is about 9022.9383794859. The cubic root of 81413417 is about 433.4097339978.

The spelling of 81413417 in words is "eighty-one million, four hundred thirteen thousand, four hundred seventeen".