53556891 has 4 divisors (see below), whose sum is σ = 71409192. Its totient is φ = 35704592.

The previous prime is 53556889. The next prime is 53556911. The reversal of 53556891 is 19865535.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53556891 - 2¹ = 53556889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53556091) 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, 8926146 + ... + 8926151.

It is an arithmetic number, because the mean of its divisors is an integer number (17852298).

Almost surely, 2^53556891 is an apocalyptic number.

53556891 is a deficient number, since it is larger than the sum of its proper divisors (17852301).

53556891 is a wasteful number, since it uses less digits than its factorization.

53556891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17852300.

The product of its digits is 162000, while the sum is 42.

The square root of 53556891 is about 7318.2573745394. The cubic root of 53556891 is about 376.9396179447.

It can be divided in two parts, 5355 and 6891, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 53556891 in words is "fifty-three million, five hundred fifty-six thousand, eight hundred ninety-one".