53121861 has 12 divisors (see below), whose sum is σ = 82634188. Its totient is φ = 32690304.

The previous prime is 53121857. The next prime is 53121869. The reversal of 53121861 is 16812135.

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 43480836 = 3105^2 + 6594^2 .

It is not a de Polignac number, because 53121861 - 2² = 53121857 is a prime.

It is a super-2 number, since 2×53121861² = 5643864232206642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53121869) 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, 226900 + ... + 227133.

Almost surely, 2^53121861 is an apocalyptic number.

It is an amenable number.

53121861 is a deficient number, since it is larger than the sum of its proper divisors (29512327).

53121861 is a wasteful number, since it uses less digits than its factorization.

53121861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454052 (or 454049 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 53121861 is about 7288.4745317522. The cubic root of 53121861 is about 375.9162448312.

Adding to 53121861 its reverse (16812135), we get a palindrome (69933996).

The spelling of 53121861 in words is "fifty-three million, one hundred twenty-one thousand, eight hundred sixty-one".