56726981 has 2 divisors, whose sum is σ = 56726982. Its totient is φ = 56726980.

The previous prime is 56726939. The next prime is 56726983. The reversal of 56726981 is 18962765.

56726981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56325025 + 401956 = 7505^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 56726981 - 2¹⁴ = 56710597 is a prime.

It is a super-2 number, since 2×56726981² = 6435900746748722, which contains 22 as substring.

Together with 56726983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56726983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28363490 + 28363491.

It is an arithmetic number, because the mean of its divisors is an integer number (28363491).

Almost surely, 2^56726981 is an apocalyptic number.

It is an amenable number.

56726981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56726981 is an equidigital number, since it uses as much as digits as its factorization.

56726981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 56726981 is about 7531.7316070078. The cubic root of 56726981 is about 384.2346768815.

The spelling of 56726981 in words is "fifty-six million, seven hundred twenty-six thousand, nine hundred eighty-one".