56398681 has 2 divisors, whose sum is σ = 56398682. Its totient is φ = 56398680.

The previous prime is 56398679. The next prime is 56398723. The reversal of 56398681 is 18689365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53158681 + 3240000 = 7291^2 + 1800^2 .

It is a cyclic number.

It is not a de Polignac number, because 56398681 - 2¹ = 56398679 is a prime.

It is a super-2 number, since 2×56398681² = 6361622437079522, which contains 22 as substring.

Together with 56398679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56398481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28199340 + 28199341.

It is an arithmetic number, because the mean of its divisors is an integer number (28199341).

Almost surely, 2^56398681 is an apocalyptic number.

It is an amenable number.

56398681 is a deficient number, since it is larger than the sum of its proper divisors (1).

56398681 is an equidigital number, since it uses as much as digits as its factorization.

56398681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 56398681 is about 7509.9055253711. The cubic root of 56398681 is about 383.4920063132.

The spelling of 56398681 in words is "fifty-six million, three hundred ninety-eight thousand, six hundred eighty-one".