53128861 has 4 divisors (see below), whose sum is σ = 53151424. Its totient is φ = 53106300.

The previous prime is 53128853. The next prime is 53128903. The reversal of 53128861 is 16882135.

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 not a de Polignac number, because 53128861 - 2³ = 53128853 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 (53128561) 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, 7275 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (13287856).

Almost surely, 2^53128861 is an apocalyptic number.

It is an amenable number.

53128861 is a deficient number, since it is larger than the sum of its proper divisors (22563).

53128861 is a wasteful number, since it uses less digits than its factorization.

53128861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22562.

The product of its digits is 11520, while the sum is 34.

The square root of 53128861 is about 7288.9547261593. The cubic root of 53128861 is about 375.9327559127.

It can be divided in two parts, 531 and 28861, that added together give a palindrome (29392).

The spelling of 53128861 in words is "fifty-three million, one hundred twenty-eight thousand, eight hundred sixty-one".