53218031 has 4 divisors (see below), whose sum is σ = 56019000. Its totient is φ = 50417064.

The previous prime is 53218019. The next prime is 53218037. The reversal of 53218031 is 13081235.

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 53218031 - 2¹⁴ = 53201647 is a prime.

It is a super-2 number, since 2×53218031² = 5664317647033922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53217988 and 53218006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53218037) 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, 1400456 + ... + 1400493.

It is an arithmetic number, because the mean of its divisors is an integer number (14004750).

Almost surely, 2^53218031 is an apocalyptic number.

53218031 is a deficient number, since it is larger than the sum of its proper divisors (2800969).

53218031 is a wasteful number, since it uses less digits than its factorization.

53218031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800968.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 53218031 is about 7295.0689510107. The cubic root of 53218031 is about 376.1429567125.

Adding to 53218031 its reverse (13081235), we get a palindrome (66299266).

The spelling of 53218031 in words is "fifty-three million, two hundred eighteen thousand, thirty-one".