74518981 has 2 divisors, whose sum is σ = 74518982. Its totient is φ = 74518980.

The previous prime is 74518943. The next prime is 74519047. The reversal of 74518981 is 18981547.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67914081 + 6604900 = 8241^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 74518981 - 2⁹ = 74518469 is a prime.

It is a super-2 number, since 2×74518981² = 11106157058556722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74518681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37259490 + 37259491.

It is an arithmetic number, because the mean of its divisors is an integer number (37259491).

Almost surely, 2^74518981 is an apocalyptic number.

It is an amenable number.

74518981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74518981 is an equidigital number, since it uses as much as digits as its factorization.

74518981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 43.

The square root of 74518981 is about 8632.4377205978. The cubic root of 74518981 is about 420.8128269022.

The spelling of 74518981 in words is "seventy-four million, five hundred eighteen thousand, nine hundred eighty-one".