2101952161 has 4 divisors (see below), whose sum is σ = 2174433300. Its totient is φ = 2029471024.

The previous prime is 2101952147. The next prime is 2101952173. The reversal of 2101952161 is 1612591012.

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 1768707136 + 333245025 = 42056^2 + 18255^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101952161 - 2⁷ = 2101952033 is a prime.

It is a super-3 number, since 3×2101952161³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101952141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36240526 + ... + 36240583.

It is an arithmetic number, because the mean of its divisors is an integer number (543608325).

Almost surely, 2^2101952161 is an apocalyptic number.

It is an amenable number.

2101952161 is a deficient number, since it is larger than the sum of its proper divisors (72481139).

2101952161 is an equidigital number, since it uses as much as digits as its factorization.

2101952161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72481138.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 2101952161 is about 45847.0518245176. The cubic root of 2101952161 is about 1280.9758510935.

The spelling of 2101952161 in words is "two billion, one hundred one million, nine hundred fifty-two thousand, one hundred sixty-one".