75117121 has 4 divisors (see below), whose sum is σ = 75595732. Its totient is φ = 74638512.

The previous prime is 75117113. The next prime is 75117131. The reversal of 75117121 is 12171157.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12171157 = 2251 ⋅5407.

It can be written as a sum of positive squares in 2 ways, for example, as 44036496 + 31080625 = 6636^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 75117121 - 2³ = 75117113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75117131) 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, 239070 + ... + 239383.

It is an arithmetic number, because the mean of its divisors is an integer number (18898933).

Almost surely, 2^75117121 is an apocalyptic number.

It is an amenable number.

75117121 is a deficient number, since it is larger than the sum of its proper divisors (478611).

75117121 is a wasteful number, since it uses less digits than its factorization.

75117121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478610.

The product of its digits is 490, while the sum is 25.

The square root of 75117121 is about 8667.0133840903. The cubic root of 75117121 is about 421.9357377645.

Adding to 75117121 its reverse (12171157), we get a palindrome (87288278).

The spelling of 75117121 in words is "seventy-five million, one hundred seventeen thousand, one hundred twenty-one".