161265361 has 4 divisors (see below), whose sum is σ = 161301412. Its totient is φ = 161229312.

The previous prime is 161265359. The next prime is 161265367. The reversal of 161265361 is 163562161.

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 81270225 + 79995136 = 9015^2 + 8944^2 .

It is a cyclic number.

It is not a de Polignac number, because 161265361 - 2¹ = 161265359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161265367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10176 + ... + 20641.

It is an arithmetic number, because the mean of its divisors is an integer number (40325353).

Almost surely, 2^161265361 is an apocalyptic number.

It is an amenable number.

161265361 is a deficient number, since it is larger than the sum of its proper divisors (36051).

161265361 is an equidigital number, since it uses as much as digits as its factorization.

161265361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36050.

The product of its digits is 6480, while the sum is 31.

The square root of 161265361 is about 12699.0299235808. The cubic root of 161265361 is about 544.3108996800.

The spelling of 161265361 in words is "one hundred sixty-one million, two hundred sixty-five thousand, three hundred sixty-one".