53216945 has 4 divisors (see below), whose sum is σ = 63860340. Its totient is φ = 42573552.

The previous prime is 53216941. The next prime is 53216951. The reversal of 53216945 is 54961235.

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 17707264 + 35509681 = 4208^2 + 5959^2 .

It is a cyclic number.

It is not a de Polignac number, because 53216945 - 2² = 53216941 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53216941) 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, 5321690 + ... + 5321699.

It is an arithmetic number, because the mean of its divisors is an integer number (15965085).

Almost surely, 2^53216945 is an apocalyptic number.

It is an amenable number.

53216945 is a deficient number, since it is larger than the sum of its proper divisors (10643395).

53216945 is a wasteful number, since it uses less digits than its factorization.

53216945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643394.

The product of its digits is 32400, while the sum is 35.

The square root of 53216945 is about 7294.9945167903. The cubic root of 53216945 is about 376.1403980933.

The spelling of 53216945 in words is "fifty-three million, two hundred sixteen thousand, nine hundred forty-five".