161423473 has 2 divisors, whose sum is σ = 161423474. Its totient is φ = 161423472.

The previous prime is 161423461. The next prime is 161423491. The reversal of 161423473 is 374324161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152078224 + 9345249 = 12332^2 + 3057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161423473 is a prime.

It is not a weakly prime, because it can be changed into another prime (161423443) 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, 80711736 + 80711737.

It is an arithmetic number, because the mean of its divisors is an integer number (80711737).

Almost surely, 2^161423473 is an apocalyptic number.

It is an amenable number.

161423473 is a deficient number, since it is larger than the sum of its proper divisors (1).

161423473 is an equidigital number, since it uses as much as digits as its factorization.

161423473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 161423473 is about 12705.2537558287. The cubic root of 161423473 is about 544.4887307474.

The spelling of 161423473 in words is "one hundred sixty-one million, four hundred twenty-three thousand, four hundred seventy-three".