53231561 has 4 divisors (see below), whose sum is σ = 53284224. Its totient is φ = 53178900.

The previous prime is 53231551. The next prime is 53231569. The reversal of 53231561 is 16513235.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53231561 is a prime.

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 53231561.

It is not an unprimeable number, because it can be changed into a prime (53231569) 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, 24785 + ... + 26846.

It is an arithmetic number, because the mean of its divisors is an integer number (13321056).

Almost surely, 2^53231561 is an apocalyptic number.

It is an amenable number.

53231561 is a deficient number, since it is larger than the sum of its proper divisors (52663).

53231561 is a wasteful number, since it uses less digits than its factorization.

53231561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52662.

The product of its digits is 2700, while the sum is 26.

The square root of 53231561 is about 7295.9962308104. The cubic root of 53231561 is about 376.1748305147.

Adding to 53231561 its reverse (16513235), we get a palindrome (69744796).

The spelling of 53231561 in words is "fifty-three million, two hundred thirty-one thousand, five hundred sixty-one".