121312165 has 8 divisors (see below), whose sum is σ = 156772728. Its totient is φ = 89584320.

The previous prime is 121312151. The next prime is 121312171. The reversal of 121312165 is 561213121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3969 + 121308196 = 63^2 + 11014^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121312165 - 2²³ = 112923557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 933106 + ... + 933235.

It is an arithmetic number, because the mean of its divisors is an integer number (19596591).

Almost surely, 2^121312165 is an apocalyptic number.

It is an amenable number.

121312165 is a deficient number, since it is larger than the sum of its proper divisors (35460563).

121312165 is a wasteful number, since it uses less digits than its factorization.

121312165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866359.

The product of its digits is 360, while the sum is 22.

The square root of 121312165 is about 11014.1801782974. The cubic root of 121312165 is about 495.0337221525.

Adding to 121312165 its reverse (561213121), we get a palindrome (682525286).

The spelling of 121312165 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred sixty-five".