51564263 has 4 divisors (see below), whose sum is σ = 52046280. Its totient is φ = 51082248.

The previous prime is 51564257. The next prime is 51564269. The reversal of 51564263 is 36246515.

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

It is an interprime number because it is at equal distance from previous prime (51564257) and next prime (51564269).

It is a cyclic number.

It is not a de Polignac number, because 51564263 - 2¹⁴ = 51547879 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 (51564269) 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, 240848 + ... + 241061.

It is an arithmetic number, because the mean of its divisors is an integer number (13011570).

Almost surely, 2^51564263 is an apocalyptic number.

51564263 is a deficient number, since it is larger than the sum of its proper divisors (482017).

51564263 is a wasteful number, since it uses less digits than its factorization.

51564263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482016.

The product of its digits is 21600, while the sum is 32.

The square root of 51564263 is about 7180.8260666862. The cubic root of 51564263 is about 372.2056302332.

The spelling of 51564263 in words is "fifty-one million, five hundred sixty-four thousand, two hundred sixty-three".