56681549 has 2 divisors, whose sum is σ = 56681550. Its totient is φ = 56681548.

The previous prime is 56681543. The next prime is 56681551. The reversal of 56681549 is 94518665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28697449 + 27984100 = 5357^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 56681549 - 2⁴ = 56681533 is a prime.

Together with 56681551, 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 (56681543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28340774 + 28340775.

It is an arithmetic number, because the mean of its divisors is an integer number (28340775).

Almost surely, 2^56681549 is an apocalyptic number.

It is an amenable number.

56681549 is a deficient number, since it is larger than the sum of its proper divisors (1).

56681549 is an equidigital number, since it uses as much as digits as its factorization.

56681549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 44.

The square root of 56681549 is about 7528.7149633918. The cubic root of 56681549 is about 384.1320730772.

The spelling of 56681549 in words is "fifty-six million, six hundred eighty-one thousand, five hundred forty-nine".