53215231 has 4 divisors (see below), whose sum is σ = 53247672. Its totient is φ = 53182792.

The previous prime is 53215229. The next prime is 53215247. The reversal of 53215231 is 13251235.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13251235 = 5 ⋅2650247.

It is a cyclic number.

It is not a de Polignac number, because 53215231 - 2¹ = 53215229 is a prime.

It is a super-2 number, since 2×53215231² = 5663721620766722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53215271) 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, 13621 + ... + 17086.

It is an arithmetic number, because the mean of its divisors is an integer number (13311918).

Almost surely, 2^53215231 is an apocalyptic number.

53215231 is a deficient number, since it is larger than the sum of its proper divisors (32441).

53215231 is a wasteful number, since it uses less digits than its factorization.

53215231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32440.

The product of its digits is 900, while the sum is 22.

The square root of 53215231 is about 7294.8770380316. The cubic root of 53215231 is about 376.1363598334.

Adding to 53215231 its reverse (13251235), we get a palindrome (66466466).

The spelling of 53215231 in words is "fifty-three million, two hundred fifteen thousand, two hundred thirty-one".