75709121 has 4 divisors (see below), whose sum is σ = 76068144. Its totient is φ = 75350100.

The previous prime is 75709087. The next prime is 75709133. The reversal of 75709121 is 12190757.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12190757 = 59 ⋅206623.

It is a cyclic number.

It is not a de Polignac number, because 75709121 - 2¹⁰ = 75708097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75709171) 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, 179195 + ... + 179616.

It is an arithmetic number, because the mean of its divisors is an integer number (19017036).

Almost surely, 2^75709121 is an apocalyptic number.

It is an amenable number.

75709121 is a deficient number, since it is larger than the sum of its proper divisors (359023).

75709121 is a wasteful number, since it uses less digits than its factorization.

75709121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359022.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 75709121 is about 8701.0988386525. The cubic root of 75709121 is about 423.0412674652.

Adding to 75709121 its reverse (12190757), we get a palindrome (87899878).

The spelling of 75709121 in words is "seventy-five million, seven hundred nine thousand, one hundred twenty-one".