74397581 has 2 divisors, whose sum is σ = 74397582. Its totient is φ = 74397580.

The previous prime is 74397527. The next prime is 74397607. The reversal of 74397581 is 18579347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63282025 + 11115556 = 7955^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 74397581 - 2¹⁸ = 74135437 is a prime.

It is a super-2 number, since 2×74397581² = 11070000117303122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74397781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37198790 + 37198791.

It is an arithmetic number, because the mean of its divisors is an integer number (37198791).

Almost surely, 2^74397581 is an apocalyptic number.

It is an amenable number.

74397581 is a deficient number, since it is larger than the sum of its proper divisors (1).

74397581 is an equidigital number, since it uses as much as digits as its factorization.

74397581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 74397581 is about 8625.4032369507. The cubic root of 74397581 is about 420.5841851805.

The spelling of 74397581 in words is "seventy-four million, three hundred ninety-seven thousand, five hundred eighty-one".