51564305 has 8 divisors (see below), whose sum is σ = 66637032. Its totient is φ = 38078208.

The previous prime is 51564301. The next prime is 51564307. The reversal of 51564305 is 50346515.

It can be written as a sum of positive squares in 4 ways, for example, as 5650129 + 45914176 = 2377^2 + 6776^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51564305 - 2² = 51564301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51564301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396584 + ... + 396713.

It is an arithmetic number, because the mean of its divisors is an integer number (8329629).

Almost surely, 2^51564305 is an apocalyptic number.

It is an amenable number.

51564305 is a deficient number, since it is larger than the sum of its proper divisors (15072727).

51564305 is a wasteful number, since it uses less digits than its factorization.

51564305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793315.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 51564305 is about 7180.8289911402. The cubic root of 51564305 is about 372.2057312892.

The spelling of 51564305 in words is "fifty-one million, five hundred sixty-four thousand, three hundred five".