55512161 has 2 divisors, whose sum is σ = 55512162. Its totient is φ = 55512160.

The previous prime is 55512151. The next prime is 55512187. The reversal of 55512161 is 16121555.

It is an a-pointer prime, because the next prime (55512187) can be obtained adding 55512161 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 1210000 = 7369^2 + 1100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55512161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55512161.

It is not a weakly prime, because it can be changed into another prime (55512151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27756080 + 27756081.

It is an arithmetic number, because the mean of its divisors is an integer number (27756081).

Almost surely, 2^55512161 is an apocalyptic number.

It is an amenable number.

55512161 is a deficient number, since it is larger than the sum of its proper divisors (1).

55512161 is an equidigital number, since it uses as much as digits as its factorization.

55512161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 26.

The square root of 55512161 is about 7450.6483610489. The cubic root of 55512161 is about 381.4720395745.

The spelling of 55512161 in words is "fifty-five million, five hundred twelve thousand, one hundred sixty-one".