40052173391 has 4 divisors (see below), whose sum is σ = 40061643984. Its totient is φ = 40042702800.

The previous prime is 40052173379. The next prime is 40052173393. The reversal of 40052173391 is 19337125004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40052173391 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 (40052173393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4728950 + ... + 4737411.

It is an arithmetic number, because the mean of its divisors is an integer number (10015410996).

Almost surely, 2^40052173391 is an apocalyptic number.

40052173391 is a deficient number, since it is larger than the sum of its proper divisors (9470593).

40052173391 is an equidigital number, since it uses as much as digits as its factorization.

40052173391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470592.

The product of its (nonzero) digits is 22680, while the sum is 35.

Adding to 40052173391 its reverse (19337125004), we get a palindrome (59389298395).

The spelling of 40052173391 in words is "forty billion, fifty-two million, one hundred seventy-three thousand, three hundred ninety-one".