56881109 has 2 divisors, whose sum is σ = 56881110. Its totient is φ = 56881108.

The previous prime is 56881087. The next prime is 56881127. The reversal of 56881109 is 90118865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 1898884 = 7415^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 56881109 - 2¹⁶ = 56815573 is a prime.

It is a super-3 number, since 3×56881109³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56881129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28440554 + 28440555.

It is an arithmetic number, because the mean of its divisors is an integer number (28440555).

Almost surely, 2^56881109 is an apocalyptic number.

It is an amenable number.

56881109 is a deficient number, since it is larger than the sum of its proper divisors (1).

56881109 is an equidigital number, since it uses as much as digits as its factorization.

56881109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 56881109 is about 7541.9565763799. The cubic root of 56881109 is about 384.5823525201.

The spelling of 56881109 in words is "fifty-six million, eight hundred eighty-one thousand, one hundred nine".