74168621 has 2 divisors, whose sum is σ = 74168622. Its totient is φ = 74168620.

The previous prime is 74168617. The next prime is 74168623. The reversal of 74168621 is 12686147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 5692996 = 8275^2 + 2386^2 .

It is an emirp because it is prime and its reverse (12686147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74168621 - 2² = 74168617 is a prime.

Together with 74168623, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4348439 and since 74168621 and 4348439 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74168623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37084310 + 37084311.

It is an arithmetic number, because the mean of its divisors is an integer number (37084311).

Almost surely, 2^74168621 is an apocalyptic number.

It is an amenable number.

74168621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74168621 is an equidigital number, since it uses as much as digits as its factorization.

74168621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 74168621 is about 8612.1205867080. The cubic root of 74168621 is about 420.1522898230.

The spelling of 74168621 in words is "seventy-four million, one hundred sixty-eight thousand, six hundred twenty-one".