53117861 has 4 divisors (see below), whose sum is σ = 53195424. Its totient is φ = 53040300.

The previous prime is 53117851. The next prime is 53117881. The reversal of 53117861 is 16871135.

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 53117861 - 2¹⁸ = 52855717 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 (53117851) 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, 37745 + ... + 39126.

It is an arithmetic number, because the mean of its divisors is an integer number (13298856).

Almost surely, 2^53117861 is an apocalyptic number.

It is an amenable number.

53117861 is a deficient number, since it is larger than the sum of its proper divisors (77563).

53117861 is an equidigital number, since it uses as much as digits as its factorization.

53117861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77562.

The product of its digits is 5040, while the sum is 32.

The square root of 53117861 is about 7288.2001207431. The cubic root of 53117861 is about 375.9068092762.

Adding to 53117861 its reverse (16871135), we get a palindrome (69988996).

The spelling of 53117861 in words is "fifty-three million, one hundred seventeen thousand, eight hundred sixty-one".