51620563 has 4 divisors (see below), whose sum is σ = 52327768. Its totient is φ = 50913360.

The previous prime is 51620531. The next prime is 51620567. The reversal of 51620563 is 36502615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36502615 = 5 ⋅7300523.

It is a cyclic number.

It is not a de Polignac number, because 51620563 - 2⁵ = 51620531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51620567) 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, 353493 + ... + 353638.

It is an arithmetic number, because the mean of its divisors is an integer number (13081942).

Almost surely, 2^51620563 is an apocalyptic number.

51620563 is a deficient number, since it is larger than the sum of its proper divisors (707205).

51620563 is an equidigital number, since it uses as much as digits as its factorization.

51620563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707204.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 51620563 is about 7184.7451590157. The cubic root of 51620563 is about 372.3410441408.

The spelling of 51620563 in words is "fifty-one million, six hundred twenty thousand, five hundred sixty-three".