161230261 has 8 divisors (see below), whose sum is σ = 171353880. Its totient is φ = 151177728.

The previous prime is 161230247. The next prime is 161230283. The reversal of 161230261 is 162032161.

It can be written as a sum of positive squares in 4 ways, for example, as 422500 + 160807761 = 650^2 + 12681^2 .

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 161230261 - 2⁵ = 161230229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161230211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13056 + ... + 22201.

It is an arithmetic number, because the mean of its divisors is an integer number (21419235).

Almost surely, 2^161230261 is an apocalyptic number.

It is an amenable number.

161230261 is a deficient number, since it is larger than the sum of its proper divisors (10123619).

161230261 is a wasteful number, since it uses less digits than its factorization.

161230261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35543.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 161230261 is about 12697.6478530474. The cubic root of 161230261 is about 544.2714063903.

The spelling of 161230261 in words is "one hundred sixty-one million, two hundred thirty thousand, two hundred sixty-one".