74123509 has 2 divisors, whose sum is σ = 74123510. Its totient is φ = 74123508.

The previous prime is 74123461. The next prime is 74123527. The reversal of 74123509 is 90532147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72301009 + 1822500 = 8503^2 + 1350^2 .

It is an emirp because it is prime and its reverse (90532147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74123509 - 2⁷ = 74123381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74123209) 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, 37061754 + 37061755.

It is an arithmetic number, because the mean of its divisors is an integer number (37061755).

Almost surely, 2^74123509 is an apocalyptic number.

It is an amenable number.

74123509 is a deficient number, since it is larger than the sum of its proper divisors (1).

74123509 is an equidigital number, since it uses as much as digits as its factorization.

74123509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 74123509 is about 8609.5010889133. The cubic root of 74123509 is about 420.0670886783.

The spelling of 74123509 in words is "seventy-four million, one hundred twenty-three thousand, five hundred nine".