74225813 has 2 divisors, whose sum is σ = 74225814. Its totient is φ = 74225812.

The previous prime is 74225777. The next prime is 74225887. The reversal of 74225813 is 31852247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51739249 + 22486564 = 7193^2 + 4742^2 .

It is a cyclic number.

It is not a de Polignac number, because 74225813 - 2¹² = 74221717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74225813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74225113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37112906 + 37112907.

It is an arithmetic number, because the mean of its divisors is an integer number (37112907).

Almost surely, 2^74225813 is an apocalyptic number.

It is an amenable number.

74225813 is a deficient number, since it is larger than the sum of its proper divisors (1).

74225813 is an equidigital number, since it uses as much as digits as its factorization.

74225813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 74225813 is about 8615.4403834047. The cubic root of 74225813 is about 420.2602563083.

The spelling of 74225813 in words is "seventy-four million, two hundred twenty-five thousand, eight hundred thirteen".