161512229 has 2 divisors, whose sum is σ = 161512230. Its totient is φ = 161512228.

The previous prime is 161512207. The next prime is 161512259. The reversal of 161512229 is 922215161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104509729 + 57002500 = 10223^2 + 7550^2 .

It is a cyclic number.

It is not a de Polignac number, because 161512229 - 2¹² = 161508133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161512259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80756114 + 80756115.

It is an arithmetic number, because the mean of its divisors is an integer number (80756115).

Almost surely, 2^161512229 is an apocalyptic number.

It is an amenable number.

161512229 is a deficient number, since it is larger than the sum of its proper divisors (1).

161512229 is an equidigital number, since it uses as much as digits as its factorization.

161512229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 161512229 is about 12708.7461616007. The cubic root of 161512229 is about 544.5885051408.

The spelling of 161512229 in words is "one hundred sixty-one million, five hundred twelve thousand, two hundred twenty-nine".