52991604439 has 4 divisors (see below), whose sum is σ = 52992838656. Its totient is φ = 52990370224.

The previous prime is 52991604403. The next prime is 52991604473. The reversal of 52991604439 is 93440619925.

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 52991604439 - 2⁷ = 52991604311 is a prime.

It is a super-2 number, since 2×52991604439² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52991604539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550294 + ... + 639379.

It is an arithmetic number, because the mean of its divisors is an integer number (13248209664).

Almost surely, 2^52991604439 is an apocalyptic number.

52991604439 is a deficient number, since it is larger than the sum of its proper divisors (1234217).

52991604439 is a wasteful number, since it uses less digits than its factorization.

52991604439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234216.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 52991604439 in words is "fifty-two billion, nine hundred ninety-one million, six hundred four thousand, four hundred thirty-nine".