74985173 has 2 divisors, whose sum is σ = 74985174. Its totient is φ = 74985172.

The previous prime is 74985161. The next prime is 74985179. The reversal of 74985173 is 37158947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 11336689 = 7978^2 + 3367^2 .

It is a cyclic number.

It is not a de Polignac number, because 74985173 - 2⁶ = 74985109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74985179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37492586 + 37492587.

It is an arithmetic number, because the mean of its divisors is an integer number (37492587).

Almost surely, 2^74985173 is an apocalyptic number.

It is an amenable number.

74985173 is a deficient number, since it is larger than the sum of its proper divisors (1).

74985173 is an equidigital number, since it uses as much as digits as its factorization.

74985173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 74985173 is about 8659.3979582879. The cubic root of 74985173 is about 421.6885406502.

The spelling of 74985173 in words is "seventy-four million, nine hundred eighty-five thousand, one hundred seventy-three".