551505161 has 2 divisors, whose sum is σ = 551505162. Its totient is φ = 551505160.

The previous prime is 551505137. The next prime is 551505169. The reversal of 551505161 is 161505155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289680400 + 261824761 = 17020^2 + 16181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551505161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (551505169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275752580 + 275752581.

It is an arithmetic number, because the mean of its divisors is an integer number (275752581).

Almost surely, 2^551505161 is an apocalyptic number.

It is an amenable number.

551505161 is a deficient number, since it is larger than the sum of its proper divisors (1).

551505161 is an equidigital number, since it uses as much as digits as its factorization.

551505161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 551505161 is about 23484.1470145288. The cubic root of 551505161 is about 820.0679900991.

The spelling of 551505161 in words is "five hundred fifty-one million, five hundred five thousand, one hundred sixty-one".