161601941 has 4 divisors (see below), whose sum is σ = 161847084. Its totient is φ = 161356800.

The previous prime is 161601911. The next prime is 161601943. The reversal of 161601941 is 149106161.

161601941 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 48094225 + 113507716 = 6935^2 + 10654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161601941 is a prime.

It is a super-2 number, since 2×161601941² = 52230374669934962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161601943) 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, 121580 + ... + 122901.

It is an arithmetic number, because the mean of its divisors is an integer number (40461771).

Almost surely, 2^161601941 is an apocalyptic number.

It is an amenable number.

161601941 is a deficient number, since it is larger than the sum of its proper divisors (245143).

161601941 is an equidigital number, since it uses as much as digits as its factorization.

161601941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245142.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 161601941 is about 12712.2752094187. The cubic root of 161601941 is about 544.6893170759.

The spelling of 161601941 in words is "one hundred sixty-one million, six hundred one thousand, nine hundred forty-one".