74329621 has 2 divisors, whose sum is σ = 74329622. Its totient is φ = 74329620.

The previous prime is 74329601. The next prime is 74329631. The reversal of 74329621 is 12692347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71487025 + 2842596 = 8455^2 + 1686^2 .

It is an emirp because it is prime and its reverse (12692347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74329621 - 2⁵ = 74329589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74329601) 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 as a sum of consecutive naturals, namely, 37164810 + 37164811.

It is an arithmetic number, because the mean of its divisors is an integer number (37164811).

Almost surely, 2^74329621 is an apocalyptic number.

It is an amenable number.

74329621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74329621 is an equidigital number, since it uses as much as digits as its factorization.

74329621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 74329621 is about 8621.4628109156. The cubic root of 74329621 is about 420.4560824094.

The spelling of 74329621 in words is "seventy-four million, three hundred twenty-nine thousand, six hundred twenty-one".