74845121 has 4 divisors (see below), whose sum is σ = 80602452. Its totient is φ = 69087792.

The previous prime is 74845093. The next prime is 74845249. The reversal of 74845121 is 12154847.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12154847 = 17 ⋅714991.

It can be written as a sum of positive squares in 2 ways, for example, as 50481025 + 24364096 = 7105^2 + 4936^2 .

It is a cyclic number.

It is not a de Polignac number, because 74845121 - 2¹⁴ = 74828737 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 (74845021) 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, 2878646 + ... + 2878671.

It is an arithmetic number, because the mean of its divisors is an integer number (20150613).

Almost surely, 2^74845121 is an apocalyptic number.

It is an amenable number.

74845121 is a deficient number, since it is larger than the sum of its proper divisors (5757331).

74845121 is a wasteful number, since it uses less digits than its factorization.

74845121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5757330.

The product of its digits is 8960, while the sum is 32.

The square root of 74845121 is about 8651.3074734401. The cubic root of 74845121 is about 421.4258436945.

Adding to 74845121 its reverse (12154847), we get a palindrome (86999968).

The spelling of 74845121 in words is "seventy-four million, eight hundred forty-five thousand, one hundred twenty-one".