53121313 has 8 divisors (see below), whose sum is σ = 60937920. Its totient is φ = 45361680.

The previous prime is 53121251. The next prime is 53121319. The reversal of 53121313 is 31312135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53121313 - 2²¹ = 51024161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53121319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12223 + ... + 15988.

It is an arithmetic number, because the mean of its divisors is an integer number (7617240).

Almost surely, 2^53121313 is an apocalyptic number.

It is an amenable number.

53121313 is a deficient number, since it is larger than the sum of its proper divisors (7816607).

53121313 is a wasteful number, since it uses less digits than its factorization.

53121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28487.

The product of its digits is 270, while the sum is 19.

The square root of 53121313 is about 7288.4369380547. The cubic root of 53121313 is about 375.9149521881.

Adding to 53121313 its reverse (31312135), we get a palindrome (84433448).

The spelling of 53121313 in words is "fifty-three million, one hundred twenty-one thousand, three hundred thirteen".