74133721 has 2 divisors, whose sum is σ = 74133722. Its totient is φ = 74133720.

The previous prime is 74133713. The next prime is 74133743. The reversal of 74133721 is 12733147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54597321 + 19536400 = 7389^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 74133721 - 2³ = 74133713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74133721.

It is not a weakly prime, because it can be changed into another prime (74133751) 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, 37066860 + 37066861.

It is an arithmetic number, because the mean of its divisors is an integer number (37066861).

Almost surely, 2^74133721 is an apocalyptic number.

It is an amenable number.

74133721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74133721 is an equidigital number, since it uses as much as digits as its factorization.

74133721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 74133721 is about 8610.0941342125. The cubic root of 74133721 is about 420.0863786813.

Adding to 74133721 its reverse (12733147), we get a palindrome (86866868).

The spelling of 74133721 in words is "seventy-four million, one hundred thirty-three thousand, seven hundred twenty-one".