82121741 has 4 divisors (see below), whose sum is σ = 88438812. Its totient is φ = 75804672.

The previous prime is 82121731. The next prime is 82121761. The reversal of 82121741 is 14712128.

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 22600516 + 59521225 = 4754^2 + 7715^2 .

It is a cyclic number.

It is not a de Polignac number, because 82121741 - 2¹⁸ = 81859597 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 82121741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3158516 + ... + 3158541.

It is an arithmetic number, because the mean of its divisors is an integer number (22109703).

Almost surely, 2^82121741 is an apocalyptic number.

It is an amenable number.

82121741 is a deficient number, since it is larger than the sum of its proper divisors (6317071).

82121741 is a wasteful number, since it uses less digits than its factorization.

82121741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317070.

The product of its digits is 896, while the sum is 26.

The square root of 82121741 is about 9062.1046672393. The cubic root of 82121741 is about 434.6630428827.

Adding to 82121741 its reverse (14712128), we get a palindrome (96833869).

The spelling of 82121741 in words is "eighty-two million, one hundred twenty-one thousand, seven hundred forty-one".