56388281 has 2 divisors, whose sum is σ = 56388282. Its totient is φ = 56388280.

The previous prime is 56388253. The next prime is 56388289. The reversal of 56388281 is 18288365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 512656 = 7475^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 56388281 - 2¹⁰ = 56387257 is a prime.

It is a super-2 number, since 2×56388281² = 6359276468269922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56388289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28194140 + 28194141.

It is an arithmetic number, because the mean of its divisors is an integer number (28194141).

Almost surely, 2^56388281 is an apocalyptic number.

It is an amenable number.

56388281 is a deficient number, since it is larger than the sum of its proper divisors (1).

56388281 is an equidigital number, since it uses as much as digits as its factorization.

56388281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 41.

The square root of 56388281 is about 7509.2130746171. The cubic root of 56388281 is about 383.4684327002.

The spelling of 56388281 in words is "fifty-six million, three hundred eighty-eight thousand, two hundred eighty-one".