74991121 has 4 divisors (see below), whose sum is σ = 75017700. Its totient is φ = 74964544.

The previous prime is 74991101. The next prime is 74991127. The reversal of 74991121 is 12119947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12119947 = 7 ⋅1731421.

It can be written as a sum of positive squares in 2 ways, for example, as 23668225 + 51322896 = 4865^2 + 7164^2 .

It is a cyclic number.

It is not a de Polignac number, because 74991121 - 2⁵ = 74991089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74991127) 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, 8476 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (18754425).

Almost surely, 2^74991121 is an apocalyptic number.

It is an amenable number.

74991121 is a deficient number, since it is larger than the sum of its proper divisors (26579).

74991121 is a wasteful number, since it uses less digits than its factorization.

74991121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26578.

The product of its digits is 4536, while the sum is 34.

The square root of 74991121 is about 8659.7413933674. The cubic root of 74991121 is about 421.6996901305.

The spelling of 74991121 in words is "seventy-four million, nine hundred ninety-one thousand, one hundred twenty-one".