56672281 has 2 divisors, whose sum is σ = 56672282. Its totient is φ = 56672280.

The previous prime is 56672257. The next prime is 56672359. The reversal of 56672281 is 18227665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 46656 = 7525^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 56672281 - 2¹¹ = 56670233 is a prime.

It is a super-2 number, since 2×56672281² = 6423494867485922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56672281.

It is not a weakly prime, because it can be changed into another prime (56672201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28336140 + 28336141.

It is an arithmetic number, because the mean of its divisors is an integer number (28336141).

Almost surely, 2^56672281 is an apocalyptic number.

It is an amenable number.

56672281 is a deficient number, since it is larger than the sum of its proper divisors (1).

56672281 is an equidigital number, since it uses as much as digits as its factorization.

56672281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 56672281 is about 7528.0994281425. The cubic root of 56672281 is about 384.1111354577. Note that the first 4 decimals are identical.

It can be divided in two parts, 56672 and 281, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 56672281 in words is "fifty-six million, six hundred seventy-two thousand, two hundred eighty-one".