74531309 has 2 divisors, whose sum is σ = 74531310. Its totient is φ = 74531308.

The previous prime is 74531299. The next prime is 74531323. The reversal of 74531309 is 90313547.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 2111209 = 8510^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 74531309 - 2²⁰ = 73482733 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 (74531329) 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, 37265654 + 37265655.

It is an arithmetic number, because the mean of its divisors is an integer number (37265655).

Almost surely, 2^74531309 is an apocalyptic number.

It is an amenable number.

74531309 is a deficient number, since it is larger than the sum of its proper divisors (1).

74531309 is an equidigital number, since it uses as much as digits as its factorization.

74531309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 74531309 is about 8633.1517419770. The cubic root of 74531309 is about 420.8360312563.

The spelling of 74531309 in words is "seventy-four million, five hundred thirty-one thousand, three hundred nine".