74137321 has 2 divisors, whose sum is σ = 74137322. Its totient is φ = 74137320.

The previous prime is 74137319. The next prime is 74137361. The reversal of 74137321 is 12373147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 4247721 = 8360^2 + 2061^2 .

It is a cyclic number.

It is not a de Polignac number, because 74137321 - 2¹ = 74137319 is a prime.

Together with 74137319, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 74137321.

It is not a weakly prime, because it can be changed into another prime (74137361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37068660 + 37068661.

It is an arithmetic number, because the mean of its divisors is an integer number (37068661).

Almost surely, 2^74137321 is an apocalyptic number.

It is an amenable number.

74137321 is a deficient number, since it is larger than the sum of its proper divisors (1).

74137321 is an equidigital number, since it uses as much as digits as its factorization.

74137321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 28.

The square root of 74137321 is about 8610.3031886223. The cubic root of 74137321 is about 420.0931784950.

The spelling of 74137321 in words is "seventy-four million, one hundred thirty-seven thousand, three hundred twenty-one".