74221751 has 4 divisors (see below), whose sum is σ = 74495904. Its totient is φ = 73947600.

The previous prime is 74221747. The next prime is 74221753. The reversal of 74221751 is 15712247.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 74221751 - 2² = 74221747 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 (74221753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136670 + ... + 137211.

It is an arithmetic number, because the mean of its divisors is an integer number (18623976).

Almost surely, 2^74221751 is an apocalyptic number.

74221751 is a deficient number, since it is larger than the sum of its proper divisors (274153).

74221751 is a wasteful number, since it uses less digits than its factorization.

74221751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274152.

The product of its digits is 3920, while the sum is 29.

The square root of 74221751 is about 8615.2046406339. The cubic root of 74221751 is about 420.2525899353.

Adding to 74221751 its reverse (15712247), we get a palindrome (89933998).

The spelling of 74221751 in words is "seventy-four million, two hundred twenty-one thousand, seven hundred fifty-one".