55872161 has 2 divisors, whose sum is σ = 55872162. Its totient is φ = 55872160.

The previous prime is 55872127. The next prime is 55872163. The reversal of 55872161 is 16127855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35224225 + 20647936 = 5935^2 + 4544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55872161 is a prime.

It is a Sophie Germain prime.

Together with 55872163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55872163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27936080 + 27936081.

It is an arithmetic number, because the mean of its divisors is an integer number (27936081).

Almost surely, 2^55872161 is an apocalyptic number.

It is an amenable number.

55872161 is a deficient number, since it is larger than the sum of its proper divisors (1).

55872161 is an equidigital number, since it uses as much as digits as its factorization.

55872161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 55872161 is about 7474.7682907231. The cubic root of 55872161 is about 382.2948871102.

The spelling of 55872161 in words is "fifty-five million, eight hundred seventy-two thousand, one hundred sixty-one".