53121805 has 8 divisors (see below), whose sum is σ = 69541344. Its totient is φ = 38634000.

The previous prime is 53121799. The next prime is 53121829. The reversal of 53121805 is 50812135.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-53121805 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53121805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482871 + ... + 482980.

It is an arithmetic number, because the mean of its divisors is an integer number (8692668).

Almost surely, 2^53121805 is an apocalyptic number.

53121805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53121805 is a deficient number, since it is larger than the sum of its proper divisors (16419539).

53121805 is a wasteful number, since it uses less digits than its factorization.

53121805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965867.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 53121805 is about 7288.4706900694. The cubic root of 53121805 is about 375.9161127367.

It can be divided in two parts, 5312 and 1805, that added together give a palindrome (7117).

The spelling of 53121805 in words is "fifty-three million, one hundred twenty-one thousand, eight hundred five".