74569681 has 2 divisors, whose sum is σ = 74569682. Its totient is φ = 74569680.

The previous prime is 74569637. The next prime is 74569741. The reversal of 74569681 is 18696547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40755456 + 33814225 = 6384^2 + 5815^2 .

It is an emirp because it is prime and its reverse (18696547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74569681 - 2⁹ = 74569169 is a prime.

It is a super-2 number, since 2×74569681² = 11121274648883522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74569981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37284840 + 37284841.

It is an arithmetic number, because the mean of its divisors is an integer number (37284841).

Almost surely, 2^74569681 is an apocalyptic number.

It is an amenable number.

74569681 is a deficient number, since it is larger than the sum of its proper divisors (1).

74569681 is an equidigital number, since it uses as much as digits as its factorization.

74569681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 46.

The square root of 74569681 is about 8635.3738193549. The cubic root of 74569681 is about 420.9082405060.

The spelling of 74569681 in words is "seventy-four million, five hundred sixty-nine thousand, six hundred eighty-one".