161863241 has 4 divisors (see below), whose sum is σ = 161915412. Its totient is φ = 161811072.

The previous prime is 161863231. The next prime is 161863267. The reversal of 161863241 is 142368161.

161863241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 157879225 + 3984016 = 12565^2 + 1996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161863241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161863198 and 161863207.

It is not an unprimeable number, because it can be changed into a prime (161863211) 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, 21116 + ... + 27741.

It is an arithmetic number, because the mean of its divisors is an integer number (40478853).

Almost surely, 2^161863241 is an apocalyptic number.

It is an amenable number.

161863241 is a deficient number, since it is larger than the sum of its proper divisors (52171).

161863241 is an equidigital number, since it uses as much as digits as its factorization.

161863241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52170.

The product of its digits is 6912, while the sum is 32.

The square root of 161863241 is about 12722.5485261405. The cubic root of 161863241 is about 544.9827349130.

The spelling of 161863241 in words is "one hundred sixty-one million, eight hundred sixty-three thousand, two hundred forty-one".