161050561 has 4 divisors (see below), whose sum is σ = 184057792. Its totient is φ = 138043332.

The previous prime is 161050559. The next prime is 161050567. The reversal of 161050561 is 165050161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165050161 = 17 ⋅9708833.

It is not a de Polignac number, because 161050561 - 2¹ = 161050559 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161050567) 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, 11503605 + ... + 11503618.

It is an arithmetic number, because the mean of its divisors is an integer number (46014448).

Almost surely, 2^161050561 is an apocalyptic number.

It is an amenable number.

161050561 is a deficient number, since it is larger than the sum of its proper divisors (23007231).

161050561 is an equidigital number, since it uses as much as digits as its factorization.

161050561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23007230.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 161050561 is about 12690.5697665629. The cubic root of 161050561 is about 544.0691244072.

The spelling of 161050561 in words is "one hundred sixty-one million, fifty thousand, five hundred sixty-one".