121982165 has 8 divisors (see below), whose sum is σ = 146471640. Its totient is φ = 97523712.

The previous prime is 121982153. The next prime is 121982167. The reversal of 121982165 is 561289121.

It can be written as a sum of positive squares in 4 ways, for example, as 7941124 + 114041041 = 2818^2 + 10679^2 .

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 121982165 - 2⁶ = 121982101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121982167) 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, 2021 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (18308955).

Almost surely, 2^121982165 is an apocalyptic number.

It is an amenable number.

121982165 is a deficient number, since it is larger than the sum of its proper divisors (24489475).

121982165 is a wasteful number, since it uses less digits than its factorization.

121982165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15511.

The product of its digits is 8640, while the sum is 35.

The square root of 121982165 is about 11044.5536351634. The cubic root of 121982165 is about 495.9433969508.

The spelling of 121982165 in words is "one hundred twenty-one million, nine hundred eighty-two thousand, one hundred sixty-five".