165121115 has 8 divisors (see below), whose sum is σ = 208574160. Its totient is φ = 125144352.

The previous prime is 165121111. The next prime is 165121123. The reversal of 165121115 is 511121561.

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 165121115 - 2² = 165121111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165121111) 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, 868964 + ... + 869153.

It is an arithmetic number, because the mean of its divisors is an integer number (26071770).

Almost surely, 2^165121115 is an apocalyptic number.

165121115 is a deficient number, since it is larger than the sum of its proper divisors (43453045).

165121115 is a wasteful number, since it uses less digits than its factorization.

165121115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738141.

The product of its digits is 300, while the sum is 23.

The square root of 165121115 is about 12849.9461088364. The cubic root of 165121115 is about 548.6148228948.

Adding to 165121115 its reverse (511121561), we get a palindrome (676242676).

The spelling of 165121115 in words is "one hundred sixty-five million, one hundred twenty-one thousand, one hundred fifteen".