74694509 has 2 divisors, whose sum is σ = 74694510. Its totient is φ = 74694508.

The previous prime is 74694493. The next prime is 74694523. The reversal of 74694509 is 90549647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 28590409 = 6790^2 + 5347^2 .

It is an emirp because it is prime and its reverse (90549647) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74694509 - 2⁴ = 74694493 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74694509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74694589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37347254 + 37347255.

It is an arithmetic number, because the mean of its divisors is an integer number (37347255).

Almost surely, 2^74694509 is an apocalyptic number.

It is an amenable number.

74694509 is a deficient number, since it is larger than the sum of its proper divisors (1).

74694509 is an equidigital number, since it uses as much as digits as its factorization.

74694509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 74694509 is about 8642.5985097076. The cubic root of 74694509 is about 421.1429732768.

The spelling of 74694509 in words is "seventy-four million, six hundred ninety-four thousand, five hundred nine".