81488217 has 4 divisors (see below), whose sum is σ = 108650960. Its totient is φ = 54325476.

The previous prime is 81488203. The next prime is 81488219. The reversal of 81488217 is 71288418.

It is a happy number.

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 not a de Polignac number, because 81488217 - 2⁴ = 81488201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81488219) 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, 13581367 + ... + 13581372.

It is an arithmetic number, because the mean of its divisors is an integer number (27162740).

Almost surely, 2^81488217 is an apocalyptic number.

It is an amenable number.

81488217 is a deficient number, since it is larger than the sum of its proper divisors (27162743).

81488217 is a wasteful number, since it uses less digits than its factorization.

81488217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27162742.

The product of its digits is 28672, while the sum is 39.

The square root of 81488217 is about 9027.0824190322. The cubic root of 81488217 is about 433.5424276243.

The spelling of 81488217 in words is "eighty-one million, four hundred eighty-eight thousand, two hundred seventeen".