40591289 has 2 divisors, whose sum is σ = 40591290. Its totient is φ = 40591288.

The previous prime is 40591283. The next prime is 40591333. The reversal of 40591289 is 98219504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35904064 + 4687225 = 5992^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 40591289 - 2²⁴ = 23814073 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40591283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20295644 + 20295645.

It is an arithmetic number, because the mean of its divisors is an integer number (20295645).

Almost surely, 2^40591289 is an apocalyptic number.

It is an amenable number.

40591289 is a deficient number, since it is larger than the sum of its proper divisors (1).

40591289 is an equidigital number, since it uses as much as digits as its factorization.

40591289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 40591289 is about 6371.1293347412. The cubic root of 40591289 is about 343.6721033851.

The spelling of 40591289 in words is "forty million, five hundred ninety-one thousand, two hundred eighty-nine".