53121433493 has 4 divisors (see below), whose sum is σ = 53761450848. Its totient is φ = 52481416140.

The previous prime is 53121433481. The next prime is 53121433507. The reversal of 53121433493 is 39433412135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53121433493 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 (53121433433) 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, 320008553 + ... + 320008718.

It is an arithmetic number, because the mean of its divisors is an integer number (13440362712).

Almost surely, 2^53121433493 is an apocalyptic number.

It is an amenable number.

53121433493 is a deficient number, since it is larger than the sum of its proper divisors (640017355).

53121433493 is an equidigital number, since it uses as much as digits as its factorization.

53121433493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640017354.

The product of its digits is 116640, while the sum is 38.

The spelling of 53121433493 in words is "fifty-three billion, one hundred twenty-one million, four hundred thirty-three thousand, four hundred ninety-three".