74894581 has 2 divisors, whose sum is σ = 74894582. Its totient is φ = 74894580.

The previous prime is 74894579. The next prime is 74894587. The reversal of 74894581 is 18549847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68310225 + 6584356 = 8265^2 + 2566^2 .

It is an emirp because it is prime and its reverse (18549847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74894581 - 2¹ = 74894579 is a prime.

It is a super-2 number, since 2×74894581² = 11218396526331122, which contains 22 as substring.

Together with 74894579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74894587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37447290 + 37447291.

It is an arithmetic number, because the mean of its divisors is an integer number (37447291).

Almost surely, 2^74894581 is an apocalyptic number.

It is an amenable number.

74894581 is a deficient number, since it is larger than the sum of its proper divisors (1).

74894581 is an equidigital number, since it uses as much as digits as its factorization.

74894581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 74894581 is about 8654.1655288075. The cubic root of 74894581 is about 421.5186537189.

The spelling of 74894581 in words is "seventy-four million, eight hundred ninety-four thousand, five hundred eighty-one".