53643361 has 4 divisors (see below), whose sum is σ = 55373824. Its totient is φ = 51912900.

The previous prime is 53643341. The next prime is 53643371. The reversal of 53643361 is 16334635.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16334635 = 5 ⋅3266927.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53643361 is a prime.

It is a super-2 number, since 2×53643361² = 5755220358752642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1730431 = 53643361 / (5 + 3 + 6 + 4 + 3 + 3 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53643341) 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, 865185 + ... + 865246.

It is an arithmetic number, because the mean of its divisors is an integer number (13843456).

Almost surely, 2^53643361 is an apocalyptic number.

It is an amenable number.

53643361 is a deficient number, since it is larger than the sum of its proper divisors (1730463).

53643361 is a wasteful number, since it uses less digits than its factorization.

53643361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730462.

The product of its digits is 19440, while the sum is 31.

The square root of 53643361 is about 7324.1628190531. The cubic root of 53643361 is about 377.1423708330.

Adding to 53643361 its reverse (16334635), we get a palindrome (69977996).

The spelling of 53643361 in words is "fifty-three million, six hundred forty-three thousand, three hundred sixty-one".