53143661 has 4 divisors (see below), whose sum is σ = 53178300. Its totient is φ = 53109024.

The previous prime is 53143637. The next prime is 53143679. The reversal of 53143661 is 16634135.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23222761 + 29920900 = 4819^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 53143661 - 2¹⁰ = 53142637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53143691) 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, 14906 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (13294575).

Almost surely, 2^53143661 is an apocalyptic number.

It is an amenable number.

53143661 is a deficient number, since it is larger than the sum of its proper divisors (34639).

53143661 is a wasteful number, since it uses less digits than its factorization.

53143661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34638.

The product of its digits is 6480, while the sum is 29.

The square root of 53143661 is about 7289.9698901984. The cubic root of 53143661 is about 375.9676602825.

Adding to 53143661 its reverse (16634135), we get a palindrome (69777796).

The spelling of 53143661 in words is "fifty-three million, one hundred forty-three thousand, six hundred sixty-one".