121752517 has 4 divisors (see below), whose sum is σ = 121795596. Its totient is φ = 121709440.

The previous prime is 121752481. The next prime is 121752529. The reversal of 121752517 is 715257121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 715257121 = 21683 ⋅32987.

It can be written as a sum of positive squares in 2 ways, for example, as 109704676 + 12047841 = 10474^2 + 3471^2 .

It is a cyclic number.

It is not a de Polignac number, because 121752517 - 2¹⁹ = 121228229 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121752017) 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, 16978 + ... + 23059.

It is an arithmetic number, because the mean of its divisors is an integer number (30448899).

Almost surely, 2^121752517 is an apocalyptic number.

It is an amenable number.

121752517 is a deficient number, since it is larger than the sum of its proper divisors (43079).

121752517 is an equidigital number, since it uses as much as digits as its factorization.

121752517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43078.

The product of its digits is 4900, while the sum is 31.

The square root of 121752517 is about 11034.1523009246. The cubic root of 121752517 is about 495.6319744935.

The spelling of 121752517 in words is "one hundred twenty-one million, seven hundred fifty-two thousand, five hundred seventeen".