74113991 has 4 divisors (see below), whose sum is σ = 84701712. Its totient is φ = 63526272.

The previous prime is 74113987. The next prime is 74114009. The reversal of 74113991 is 19931147.

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: 19931147 = 79 ⋅252293.

It is a cyclic number.

It is not a de Polignac number, because 74113991 - 2² = 74113987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74112991) 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, 5293850 + ... + 5293863.

It is an arithmetic number, because the mean of its divisors is an integer number (21175428).

Almost surely, 2^74113991 is an apocalyptic number.

74113991 is a deficient number, since it is larger than the sum of its proper divisors (10587721).

74113991 is a wasteful number, since it uses less digits than its factorization.

74113991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10587720.

The product of its digits is 6804, while the sum is 35.

The square root of 74113991 is about 8608.9483097531. The cubic root of 74113991 is about 420.0491080145.

The spelling of 74113991 in words is "seventy-four million, one hundred thirteen thousand, nine hundred ninety-one".