74809549 has 2 divisors, whose sum is σ = 74809550. Its totient is φ = 74809548.

The previous prime is 74809513. The next prime is 74809591. The reversal of 74809549 is 94590847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72505225 + 2304324 = 8515^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 74809549 - 2¹⁷ = 74678477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74809499 and 74809508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74809849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37404774 + 37404775.

It is an arithmetic number, because the mean of its divisors is an integer number (37404775).

Almost surely, 2^74809549 is an apocalyptic number.

It is an amenable number.

74809549 is a deficient number, since it is larger than the sum of its proper divisors (1).

74809549 is an equidigital number, since it uses as much as digits as its factorization.

74809549 is an evil number, because the sum of its binary digits is even.

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

The square root of 74809549 is about 8649.2513548862. The cubic root of 74809549 is about 421.3590687532.

The spelling of 74809549 in words is "seventy-four million, eight hundred nine thousand, five hundred forty-nine".