75822121 has 4 divisors (see below), whose sum is σ = 75842244. Its totient is φ = 75802000.

The previous prime is 75822113. The next prime is 75822133. The reversal of 75822121 is 12122857.

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 39690000 + 36132121 = 6300^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 75822121 - 2³ = 75822113 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 75822121.

It is not an unprimeable number, because it can be changed into a prime (75822151) 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, 2530 + ... + 12571.

It is an arithmetic number, because the mean of its divisors is an integer number (18960561).

Almost surely, 2^75822121 is an apocalyptic number.

It is an amenable number.

75822121 is a deficient number, since it is larger than the sum of its proper divisors (20123).

75822121 is a wasteful number, since it uses less digits than its factorization.

75822121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20122.

The product of its digits is 2240, while the sum is 28.

The square root of 75822121 is about 8707.5898502398. The cubic root of 75822121 is about 423.2516335747.

Adding to 75822121 its reverse (12122857), we get a palindrome (87944978).

The spelling of 75822121 in words is "seventy-five million, eight hundred twenty-two thousand, one hundred twenty-one".