74042561 has 2 divisors, whose sum is σ = 74042562. Its totient is φ = 74042560.

The previous prime is 74042503. The next prime is 74042621. The reversal of 74042561 is 16524047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 10042561 = 8000^2 + 3169^2 .

It is a cyclic number.

It is not a de Polignac number, because 74042561 - 2¹⁸ = 73780417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (74042161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37021280 + 37021281.

It is an arithmetic number, because the mean of its divisors is an integer number (37021281).

Almost surely, 2^74042561 is an apocalyptic number.

It is an amenable number.

74042561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74042561 is an equidigital number, since it uses as much as digits as its factorization.

74042561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 74042561 is about 8604.7987193194. The cubic root of 74042561 is about 419.9141188727.

The spelling of 74042561 in words is "seventy-four million, forty-two thousand, five hundred sixty-one".