53121531 has 8 divisors (see below), whose sum is σ = 71253504. Its totient is φ = 35201960.

The previous prime is 53121521. The next prime is 53121539. The reversal of 53121531 is 13512135.

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

It is a cyclic number.

It is not a de Polignac number, because 53121531 - 2¹¹ = 53119483 is a prime.

It is a super-2 number, since 2×53121531² = 5643794111567922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53121498 and 53121507.

It is not an unprimeable number, because it can be changed into a prime (53121539) 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, 52515 + ... + 53516.

It is an arithmetic number, because the mean of its divisors is an integer number (8906688).

Almost surely, 2^53121531 is an apocalyptic number.

53121531 is a deficient number, since it is larger than the sum of its proper divisors (18131973).

53121531 is a wasteful number, since it uses less digits than its factorization.

53121531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106201.

The product of its digits is 450, while the sum is 21.

The square root of 53121531 is about 7288.4518932349. The cubic root of 53121531 is about 375.9154664158.

Adding to 53121531 its reverse (13512135), we get a palindrome (66633666).

The spelling of 53121531 in words is "fifty-three million, one hundred twenty-one thousand, five hundred thirty-one".