53438113261 has 4 divisors (see below), whose sum is σ = 57548737372.
Its totient is φ = 49327489152.
The previous prime is 53438113249. The next prime is 53438113273. The reversal of 53438113261 is 16231183435.
Adding to 53438113261 its reverse (16231183435), we get a palindrome (69669296696).
It is a semiprime because it is the product of two primes.
It is an interprime number because it is at equal distance from previous prime (53438113249) and next prime (53438113273).
It can be written as a sum of positive squares in 2 ways, for example, as 23387890761 + 30050222500 = 152931^2 + 173350^2
It is a cyclic number.
It is not a de Polignac number, because 53438113261 - 25 = 53438113229 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 53438113261.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (53438113231) 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, 2055312036 + ... + 2055312061.
It is an arithmetic number, because the mean of its divisors is an integer number (14387184343).
Almost surely, 253438113261 is an apocalyptic number.
It is an amenable number.
53438113261 is a deficient number, since it is larger than the sum of its proper divisors (4110624111).
53438113261 is a wasteful number, since it uses less digits than its factorization.
53438113261 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4110624110.
The product of its digits is 51840, while the sum is 37.
The spelling of 53438113261 in words is "fifty-three billion, four hundred thirty-eight million, one hundred thirteen thousand, two hundred sixty-one".