56564381 has 2 divisors, whose sum is σ = 56564382. Its totient is φ = 56564380.

The previous prime is 56564341. The next prime is 56564401. The reversal of 56564381 is 18346565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 1136356 = 7445^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 56564381 - 2²² = 52370077 is a prime.

It is a super-3 number, since 3×56564381³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56564341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28282190 + 28282191.

It is an arithmetic number, because the mean of its divisors is an integer number (28282191).

Almost surely, 2^56564381 is an apocalyptic number.

It is an amenable number.

56564381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56564381 is an equidigital number, since it uses as much as digits as its factorization.

56564381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

The square root of 56564381 is about 7520.9295303174. The cubic root of 56564381 is about 383.8672071398.

It can be divided in two parts, 565 and 64381, that added together give a palindrome (64946).

The spelling of 56564381 in words is "fifty-six million, five hundred sixty-four thousand, three hundred eighty-one".