161097473 has 4 divisors (see below), whose sum is σ = 161270340. Its totient is φ = 160924608.

The previous prime is 161097463. The next prime is 161097493. The reversal of 161097473 is 374790161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7907344 + 153190129 = 2812^2 + 12377^2 .

It is a cyclic number.

It is not a de Polignac number, because 161097473 - 2¹⁰ = 161096449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161097403) 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 in 3 ways as a sum of consecutive naturals, for example, 85028 + ... + 86901.

It is an arithmetic number, because the mean of its divisors is an integer number (40317585).

Almost surely, 2^161097473 is an apocalyptic number.

It is an amenable number.

161097473 is a deficient number, since it is larger than the sum of its proper divisors (172867).

161097473 is an equidigital number, since it uses as much as digits as its factorization.

161097473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172866.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 161097473 is about 12692.4179335539. The cubic root of 161097473 is about 544.1219461065.

The spelling of 161097473 in words is "one hundred sixty-one million, ninety-seven thousand, four hundred seventy-three".