53121650 has 24 divisors (see below), whose sum is σ = 101220084. Its totient is φ = 20729600.

The previous prime is 53121637. The next prime is 53121659. The reversal of 53121650 is 5612135.

It can be written as a sum of positive squares in 6 ways, for example, as 8779369 + 44342281 = 2963^2 + 6659^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53121659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10907 + ... + 15006.

Almost surely, 2^53121650 is an apocalyptic number.

53121650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

53121650 is a deficient number, since it is larger than the sum of its proper divisors (48098434).

53121650 is a wasteful number, since it uses less digits than its factorization.

53121650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25966 (or 25961 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 53121650 is about 7288.4600568296. The cubic root of 53121650 is about 375.9157471175.

Adding to 53121650 its reverse (5612135), we get a palindrome (58733785).

The spelling of 53121650 in words is "fifty-three million, one hundred twenty-one thousand, six hundred fifty".