74661409 has 2 divisors, whose sum is σ = 74661410. Its totient is φ = 74661408.

The previous prime is 74661401. The next prime is 74661413. The reversal of 74661409 is 90416647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44849809 + 29811600 = 6697^2 + 5460^2 .

It is a cyclic number.

It is not a de Polignac number, because 74661409 - 2³ = 74661401 is a prime.

It is not a weakly prime, because it can be changed into another prime (74661401) 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, 37330704 + 37330705.

It is an arithmetic number, because the mean of its divisors is an integer number (37330705).

Almost surely, 2^74661409 is an apocalyptic number.

It is an amenable number.

74661409 is a deficient number, since it is larger than the sum of its proper divisors (1).

74661409 is an equidigital number, since it uses as much as digits as its factorization.

74661409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 74661409 is about 8640.6833641790. The cubic root of 74661409 is about 421.0807558876.

The spelling of 74661409 in words is "seventy-four million, six hundred sixty-one thousand, four hundred nine".