121952161 has 8 divisors (see below), whose sum is σ = 123546600. Its totient is φ = 120362880.

The previous prime is 121952153. The next prime is 121952177. The reversal of 121952161 is 161259121.

It can be written as a sum of positive squares in 4 ways, for example, as 1918225 + 120033936 = 1385^2 + 10956^2 .

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 121952161 - 2³ = 121952153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121952191) 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, 72235 + ... + 73903.

It is an arithmetic number, because the mean of its divisors is an integer number (15443325).

Almost surely, 2^121952161 is an apocalyptic number.

It is an amenable number.

121952161 is a deficient number, since it is larger than the sum of its proper divisors (1594439).

121952161 is an equidigital number, since it uses as much as digits as its factorization.

121952161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

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

The square root of 121952161 is about 11043.1952350758. The cubic root of 121952161 is about 495.9027311538.

The spelling of 121952161 in words is "one hundred twenty-one million, nine hundred fifty-two thousand, one hundred sixty-one".