55817771 has 4 divisors (see below), whose sum is σ = 56582472. Its totient is φ = 55053072.

The previous prime is 55817759. The next prime is 55817789. The reversal of 55817771 is 17771855.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55817771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55817731) 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, 382241 + ... + 382386.

It is an arithmetic number, because the mean of its divisors is an integer number (14145618).

Almost surely, 2^55817771 is an apocalyptic number.

55817771 is a deficient number, since it is larger than the sum of its proper divisors (764701).

55817771 is an equidigital number, since it uses as much as digits as its factorization.

55817771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764700.

The product of its digits is 68600, while the sum is 41.

The square root of 55817771 is about 7471.1291649924. The cubic root of 55817771 is about 382.1707956764.

The spelling of 55817771 in words is "fifty-five million, eight hundred seventeen thousand, seven hundred seventy-one".