55715811 has 4 divisors (see below), whose sum is σ = 74287752. Its totient is φ = 37143872.

The previous prime is 55715797. The next prime is 55715813. The reversal of 55715811 is 11851755.

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 55715811 - 2⁹ = 55715299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55715813) 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, 9285966 + ... + 9285971.

It is an arithmetic number, because the mean of its divisors is an integer number (18571938).

Almost surely, 2^55715811 is an apocalyptic number.

55715811 is a deficient number, since it is larger than the sum of its proper divisors (18571941).

55715811 is a wasteful number, since it uses less digits than its factorization.

55715811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18571940.

The product of its digits is 7000, while the sum is 33.

The square root of 55715811 is about 7464.3024456409. The cubic root of 55715811 is about 381.9379553481.

It can be divided in two parts, 5571 and 5811, that multiplied together give a triangular number (32373081 = T₈₀₄₆).

The spelling of 55715811 in words is "fifty-five million, seven hundred fifteen thousand, eight hundred eleven".