40891597 has 2 divisors, whose sum is σ = 40891598. Its totient is φ = 40891596.

The previous prime is 40891583. The next prime is 40891601. The reversal of 40891597 is 79519804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32046921 + 8844676 = 5661^2 + 2974^2 .

It is a cyclic number.

It is not a de Polignac number, because 40891597 - 2⁷ = 40891469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40891517) 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, 20445798 + 20445799.

It is an arithmetic number, because the mean of its divisors is an integer number (20445799).

Almost surely, 2^40891597 is an apocalyptic number.

It is an amenable number.

40891597 is a deficient number, since it is larger than the sum of its proper divisors (1).

40891597 is an equidigital number, since it uses as much as digits as its factorization.

40891597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 40891597 is about 6394.6537826531. The cubic root of 40891597 is about 344.5175557333.

The spelling of 40891597 in words is "forty million, eight hundred ninety-one thousand, five hundred ninety-seven".