53721134549 has 4 divisors (see below), whose sum is σ = 53737774860. Its totient is φ = 53704494240.

The previous prime is 53721134543. The next prime is 53721134581. The reversal of 53721134549 is 94543112735.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19679039524 + 34042095025 = 140282^2 + 184505^2 .

It is a cyclic number.

It is not a de Polignac number, because 53721134549 - 2¹² = 53721130453 is a prime.

It is a super-2 number, since 2×53721134549² (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 (53721134543) 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 in 3 ways as a sum of consecutive naturals, for example, 8315312 + ... + 8321769.

It is an arithmetic number, because the mean of its divisors is an integer number (13434443715).

Almost surely, 2^53721134549 is an apocalyptic number.

It is an amenable number.

53721134549 is a deficient number, since it is larger than the sum of its proper divisors (16640311).

53721134549 is a wasteful number, since it uses less digits than its factorization.

53721134549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16640310.

The product of its digits is 453600, while the sum is 44.

The spelling of 53721134549 in words is "fifty-three billion, seven hundred twenty-one million, one hundred thirty-four thousand, five hundred forty-nine".