74061721 has 2 divisors, whose sum is σ = 74061722. Its totient is φ = 74061720.

The previous prime is 74061719. The next prime is 74061727. The reversal of 74061721 is 12716047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 3686400 = 8389^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 74061721 - 2¹ = 74061719 is a prime.

Together with 74061719, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 74061721.

It is not a weakly prime, because it can be changed into another prime (74061727) 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, 37030860 + 37030861.

It is an arithmetic number, because the mean of its divisors is an integer number (37030861).

Almost surely, 2^74061721 is an apocalyptic number.

It is an amenable number.

74061721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74061721 is an equidigital number, since it uses as much as digits as its factorization.

74061721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 74061721 is about 8605.9119795638. The cubic root of 74061721 is about 419.9503361533.

Adding to 74061721 its reverse (12716047), we get a palindrome (86777768).

The spelling of 74061721 in words is "seventy-four million, sixty-one thousand, seven hundred twenty-one".