121384517 has 4 divisors (see below), whose sum is σ = 125570220. Its totient is φ = 117198816.

The previous prime is 121384513. The next prime is 121384537. The reversal of 121384517 is 715483121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715483121 = 163 ⋅4389467.

It can be written as a sum of positive squares in 2 ways, for example, as 51394561 + 69989956 = 7169^2 + 8366^2 .

It is a cyclic number.

It is not a de Polignac number, because 121384517 - 2² = 121384513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121384513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2092808 + ... + 2092865.

It is an arithmetic number, because the mean of its divisors is an integer number (31392555).

Almost surely, 2^121384517 is an apocalyptic number.

It is an amenable number.

121384517 is a deficient number, since it is larger than the sum of its proper divisors (4185703).

121384517 is an equidigital number, since it uses as much as digits as its factorization.

121384517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185702.

The product of its digits is 6720, while the sum is 32.

The square root of 121384517 is about 11017.4641819250. The cubic root of 121384517 is about 495.1321172358.

The spelling of 121384517 in words is "one hundred twenty-one million, three hundred eighty-four thousand, five hundred seventeen".