161122259 has 2 divisors, whose sum is σ = 161122260. Its totient is φ = 161122258.

The previous prime is 161122253. The next prime is 161122319. The reversal of 161122259 is 952221161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161122259 is a prime.

It is not a weakly prime, because it can be changed into another prime (161122253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80561129 + 80561130.

It is an arithmetic number, because the mean of its divisors is an integer number (80561130).

Almost surely, 2^161122259 is an apocalyptic number.

161122259 is a deficient number, since it is larger than the sum of its proper divisors (1).

161122259 is an equidigital number, since it uses as much as digits as its factorization.

161122259 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 161122259 is about 12693.3943057009. The cubic root of 161122259 is about 544.1498503616.

The spelling of 161122259 in words is "one hundred sixty-one million, one hundred twenty-two thousand, two hundred fifty-nine".