74566981 has 4 divisors (see below), whose sum is σ = 78953292. Its totient is φ = 70180672.

The previous prime is 74566939. The next prime is 74567023. The reversal of 74566981 is 18966547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18966547 = 61 ⋅310927.

It is an interprime number because it is at equal distance from previous prime (74566939) and next prime (74567023).

It can be written as a sum of positive squares in 2 ways, for example, as 57002500 + 17564481 = 7550^2 + 4191^2 .

It is a cyclic number.

It is not a de Polignac number, because 74566981 - 2¹¹ = 74564933 is a prime.

It is a super-2 number, since 2×74566981² = 11120469310908722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74566931) 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 in 3 ways as a sum of consecutive naturals, for example, 2193130 + ... + 2193163.

It is an arithmetic number, because the mean of its divisors is an integer number (19738323).

Almost surely, 2^74566981 is an apocalyptic number.

It is an amenable number.

74566981 is a deficient number, since it is larger than the sum of its proper divisors (4386311).

74566981 is a wasteful number, since it uses less digits than its factorization.

74566981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4386310.

The product of its digits is 362880, while the sum is 46.

The square root of 74566981 is about 8635.2174842328. The cubic root of 74566981 is about 420.9031603986.

The spelling of 74566981 in words is "seventy-four million, five hundred sixty-six thousand, nine hundred eighty-one".