82743121 has 4 divisors (see below), whose sum is σ = 86340672. Its totient is φ = 79145572.

The previous prime is 82743113. The next prime is 82743149. The reversal of 82743121 is 12134728.

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 82743121 - 2³ = 82743113 is a prime.

It is a super-3 number, since 3×82743121³ (a number of 25 digits) contains 333 as substring.

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 82743121.

It is not an unprimeable number, because it can be changed into a prime (82743151) 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, 1798741 + ... + 1798786.

It is an arithmetic number, because the mean of its divisors is an integer number (21585168).

Almost surely, 2^82743121 is an apocalyptic number.

It is an amenable number.

82743121 is a deficient number, since it is larger than the sum of its proper divisors (3597551).

82743121 is a wasteful number, since it uses less digits than its factorization.

82743121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597550.

The product of its digits is 2688, while the sum is 28.

The square root of 82743121 is about 9096.3245874364. The cubic root of 82743121 is about 435.7565923164.

Adding to 82743121 its reverse (12134728), we get a palindrome (94877849).

The spelling of 82743121 in words is "eighty-two million, seven hundred forty-three thousand, one hundred twenty-one".