121644515 has 4 divisors (see below), whose sum is σ = 145973424. Its totient is φ = 97315608.

The previous prime is 121644461. The next prime is 121644557. The reversal of 121644515 is 515446121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515446121 = 317 ⋅1626013.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121644515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12164447 + ... + 12164456.

It is an arithmetic number, because the mean of its divisors is an integer number (36493356).

Almost surely, 2^121644515 is an apocalyptic number.

121644515 is a deficient number, since it is larger than the sum of its proper divisors (24328909).

121644515 is an equidigital number, since it uses as much as digits as its factorization.

121644515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24328908.

The product of its digits is 4800, while the sum is 29.

The square root of 121644515 is about 11029.2572279370. The cubic root of 121644515 is about 495.4853790841.

The spelling of 121644515 in words is "one hundred twenty-one million, six hundred forty-four thousand, five hundred fifteen".