53215973 has 4 divisors (see below), whose sum is σ = 54088428. Its totient is φ = 52343520.

The previous prime is 53215963. The next prime is 53216021. The reversal of 53215973 is 37951235.

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 15737089 + 37478884 = 3967^2 + 6122^2 .

It is a cyclic number.

It is not a de Polignac number, because 53215973 - 2⁸ = 53215717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53215963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436136 + ... + 436257.

It is an arithmetic number, because the mean of its divisors is an integer number (13522107).

Almost surely, 2^53215973 is an apocalyptic number.

It is an amenable number.

53215973 is a deficient number, since it is larger than the sum of its proper divisors (872455).

53215973 is an equidigital number, since it uses as much as digits as its factorization.

53215973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872454.

The product of its digits is 28350, while the sum is 35.

The square root of 53215973 is about 7294.9278954627. The cubic root of 53215973 is about 376.1381080289.

The spelling of 53215973 in words is "fifty-three million, two hundred fifteen thousand, nine hundred seventy-three".