555120161 has 2 divisors, whose sum is σ = 555120162. Its totient is φ = 555120160.

The previous prime is 555120133. The next prime is 555120187. The reversal of 555120161 is 161021555.

It is an a-pointer prime, because the next prime (555120187) can be obtained adding 555120161 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549621136 + 5499025 = 23444^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 555120161 - 2²² = 550925857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 555120161.

It is not a weakly prime, because it can be changed into another prime (555120121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277560080 + 277560081.

It is an arithmetic number, because the mean of its divisors is an integer number (277560081).

Almost surely, 2^555120161 is an apocalyptic number.

It is an amenable number.

555120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

555120161 is an equidigital number, since it uses as much as digits as its factorization.

555120161 is an evil number, because the sum of its binary digits is even.

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

The square root of 555120161 is about 23560.9881159513. The cubic root of 555120161 is about 821.8558802551.

The spelling of 555120161 in words is "five hundred fifty-five million, one hundred twenty thousand, one hundred sixty-one".