161273065 has 8 divisors (see below), whose sum is σ = 194511240. Its totient is φ = 128362752.

The previous prime is 161273059. The next prime is 161273071. The reversal of 161273065 is 560372161.

It is an interprime number because it is at equal distance from previous prime (161273059) and next prime (161273071).

It can be written as a sum of positive squares in 4 ways, for example, as 59182249 + 102090816 = 7693^2 + 10104^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161273065 - 2¹⁵ = 161240297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80880 + ... + 82849.

It is an arithmetic number, because the mean of its divisors is an integer number (24313905).

Almost surely, 2^161273065 is an apocalyptic number.

It is an amenable number.

161273065 is a deficient number, since it is larger than the sum of its proper divisors (33238175).

161273065 is a wasteful number, since it uses less digits than its factorization.

161273065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163931.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 161273065 is about 12699.3332502144. Note that the first 3 decimals coincide. The cubic root of 161273065 is about 544.3195671838.

The spelling of 161273065 in words is "one hundred sixty-one million, two hundred seventy-three thousand, sixty-five".