74105621 has 2 divisors, whose sum is σ = 74105622. Its totient is φ = 74105620.

The previous prime is 74105617. The next prime is 74105627. The reversal of 74105621 is 12650147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 10982596 = 7945^2 + 3314^2 .

It is an emirp because it is prime and its reverse (12650147) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74105621 - 2² = 74105617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74105627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37052810 + 37052811.

It is an arithmetic number, because the mean of its divisors is an integer number (37052811).

Almost surely, 2^74105621 is an apocalyptic number.

It is an amenable number.

74105621 is a deficient number, since it is larger than the sum of its proper divisors (1).

74105621 is an equidigital number, since it uses as much as digits as its factorization.

74105621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 74105621 is about 8608.4621739310. The cubic root of 74105621 is about 420.0332947906.

Adding to 74105621 its reverse (12650147), we get a palindrome (86755768).

It can be divided in two parts, 7410 and 5621, that added together give a palindrome (13031).

The spelling of 74105621 in words is "seventy-four million, one hundred five thousand, six hundred twenty-one".