74918321 has 2 divisors, whose sum is σ = 74918322. Its totient is φ = 74918320.

The previous prime is 74918231. The next prime is 74918323. The reversal of 74918321 is 12381947.

Together with previous prime (74918231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 9486400 = 8089^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 74918321 - 2¹⁸ = 74656177 is a prime.

It is a super-2 number, since 2×74918321² = 11225509642918082, which contains 22 as substring.

Together with 74918323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74918323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37459160 + 37459161.

It is an arithmetic number, because the mean of its divisors is an integer number (37459161).

Almost surely, 2^74918321 is an apocalyptic number.

It is an amenable number.

74918321 is a deficient number, since it is larger than the sum of its proper divisors (1).

74918321 is an equidigital number, since it uses as much as digits as its factorization.

74918321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 74918321 is about 8655.5370139582. The cubic root of 74918321 is about 421.5631865167.

The spelling of 74918321 in words is "seventy-four million, nine hundred eighteen thousand, three hundred twenty-one".