53511213 has 32 divisors (see below), whose sum is σ = 85192960. Its totient is φ = 29237760.

The previous prime is 53511197. The next prime is 53511253. The reversal of 53511213 is 31211535.

It is not a de Polignac number, because 53511213 - 2⁴ = 53511197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 53511213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53511253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46833 + ... + 47961.

It is an arithmetic number, because the mean of its divisors is an integer number (2662280).

Almost surely, 2^53511213 is an apocalyptic number.

It is an amenable number.

53511213 is a deficient number, since it is larger than the sum of its proper divisors (31681747).

53511213 is a wasteful number, since it uses less digits than its factorization.

53511213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its digits is 450, while the sum is 21.

The square root of 53511213 is about 7315.1358839054. The cubic root of 53511213 is about 376.8324251084.

53511213 divided by its sum of digits (21) gives a triangular number (2548153 = T₂₂₅₇).

Adding to 53511213 its reverse (31211535), we get a palindrome (84722748).

The spelling of 53511213 in words is "fifty-three million, five hundred eleven thousand, two hundred thirteen".