82216751 has 4 divisors (see below), whose sum is σ = 82393272. Its totient is φ = 82040232.

The previous prime is 82216721. The next prime is 82216831. The reversal of 82216751 is 15761228.

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

It is a cyclic number.

It is not a de Polignac number, because 82216751 - 2²⁶ = 15107887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82216721) 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, 87560 + ... + 88493.

It is an arithmetic number, because the mean of its divisors is an integer number (20598318).

Almost surely, 2^82216751 is an apocalyptic number.

82216751 is a deficient number, since it is larger than the sum of its proper divisors (176521).

82216751 is a wasteful number, since it uses less digits than its factorization.

82216751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176520.

The product of its digits is 6720, while the sum is 32.

The square root of 82216751 is about 9067.3453116113. The cubic root of 82216751 is about 434.8306047619.

Adding to 82216751 its reverse (15761228), we get a palindrome (97977979).

The spelling of 82216751 in words is "eighty-two million, two hundred sixteen thousand, seven hundred fifty-one".