56611811 has 4 divisors (see below), whose sum is σ = 59591400. Its totient is φ = 53632224.

The previous prime is 56611801. The next prime is 56611823. The reversal of 56611811 is 11811665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56611811 - 2⁶ = 56611747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56611801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489766 + ... + 1489803.

It is an arithmetic number, because the mean of its divisors is an integer number (14897850).

Almost surely, 2^56611811 is an apocalyptic number.

56611811 is a deficient number, since it is larger than the sum of its proper divisors (2979589).

56611811 is a wasteful number, since it uses less digits than its factorization.

56611811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979588.

The product of its digits is 1440, while the sum is 29.

The square root of 56611811 is about 7524.0820702595. The cubic root of 56611811 is about 383.9744697834.

The spelling of 56611811 in words is "fifty-six million, six hundred eleven thousand, eight hundred eleven".