56681311 has 8 divisors (see below), whose sum is σ = 58212000. Its totient is φ = 55157760.

The previous prime is 56681309. The next prime is 56681321. The reversal of 56681311 is 11318665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56681311 - 2¹ = 56681309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56681321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16870 + ... + 19948.

It is an arithmetic number, because the mean of its divisors is an integer number (7276500).

Almost surely, 2^56681311 is an apocalyptic number.

56681311 is a deficient number, since it is larger than the sum of its proper divisors (1530689).

56681311 is a wasteful number, since it uses less digits than its factorization.

56681311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569.

The product of its digits is 4320, while the sum is 31.

The square root of 56681311 is about 7528.6991572250. The cubic root of 56681311 is about 384.1315354328.

Adding to 56681311 its reverse (11318665), we get a palindrome (67999976).

The spelling of 56681311 in words is "fifty-six million, six hundred eighty-one thousand, three hundred eleven".