161022259 has 2 divisors, whose sum is σ = 161022260. Its totient is φ = 161022258.

The previous prime is 161022247. The next prime is 161022299. The reversal of 161022259 is 952220161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161022259 - 2⁹ = 161021747 is a prime.

It is not a weakly prime, because it can be changed into another prime (161022299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80511129 + 80511130.

It is an arithmetic number, because the mean of its divisors is an integer number (80511130).

Almost surely, 2^161022259 is an apocalyptic number.

161022259 is a deficient number, since it is larger than the sum of its proper divisors (1).

161022259 is an equidigital number, since it uses as much as digits as its factorization.

161022259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161022259 is about 12689.4546376115. The cubic root of 161022259 is about 544.0372521257.

The spelling of 161022259 in words is "one hundred sixty-one million, twenty-two thousand, two hundred fifty-nine".