74537921 has 2 divisors, whose sum is σ = 74537922. Its totient is φ = 74537920.

The previous prime is 74537867. The next prime is 74537923. The reversal of 74537921 is 12973547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43890625 + 30647296 = 6625^2 + 5536^2 .

It is an emirp because it is prime and its reverse (12973547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74537921 - 2¹⁸ = 74275777 is a prime.

Together with 74537923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74537923) 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 as a sum of consecutive naturals, namely, 37268960 + 37268961.

It is an arithmetic number, because the mean of its divisors is an integer number (37268961).

Almost surely, 2^74537921 is an apocalyptic number.

It is an amenable number.

74537921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74537921 is an equidigital number, since it uses as much as digits as its factorization.

74537921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 74537921 is about 8633.5346759019. The cubic root of 74537921 is about 420.8484756263.

The spelling of 74537921 in words is "seventy-four million, five hundred thirty-seven thousand, nine hundred twenty-one".