40321591 has 4 divisors (see below), whose sum is σ = 42443800. Its totient is φ = 38199384.

The previous prime is 40321583. The next prime is 40321613. The reversal of 40321591 is 19512304.

40321591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40321591 - 2³ = 40321583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40321511) 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 in 3 ways as a sum of consecutive naturals, for example, 1061076 + ... + 1061113.

It is an arithmetic number, because the mean of its divisors is an integer number (10610950).

Almost surely, 2^40321591 is an apocalyptic number.

40321591 is a deficient number, since it is larger than the sum of its proper divisors (2122209).

40321591 is a wasteful number, since it uses less digits than its factorization.

40321591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122208.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40321591 is about 6349.9284247935. The cubic root of 40321591 is about 342.9092654967.

Adding to 40321591 its reverse (19512304), we get a palindrome (59833895).

The spelling of 40321591 in words is "forty million, three hundred twenty-one thousand, five hundred ninety-one".