161243129 has 2 divisors, whose sum is σ = 161243130. Its totient is φ = 161243128.

The previous prime is 161243083. The next prime is 161243143. The reversal of 161243129 is 921342161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137428729 + 23814400 = 11723^2 + 4880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161243129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161243629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80621564 + 80621565.

It is an arithmetic number, because the mean of its divisors is an integer number (80621565).

Almost surely, 2^161243129 is an apocalyptic number.

It is an amenable number.

161243129 is a deficient number, since it is larger than the sum of its proper divisors (1).

161243129 is an equidigital number, since it uses as much as digits as its factorization.

161243129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 161243129 is about 12698.1545509574. The cubic root of 161243129 is about 544.2858856783.

The spelling of 161243129 in words is "one hundred sixty-one million, two hundred forty-three thousand, one hundred twenty-nine".