517072121 has 4 divisors (see below), whose sum is σ = 520365732. Its totient is φ = 513778512.

The previous prime is 517072097. The next prime is 517072139. The reversal of 517072121 is 121270715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121270715 = 5 ⋅24254143.

It can be written as a sum of positive squares in 2 ways, for example, as 153636025 + 363436096 = 12395^2 + 19064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517072121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (517072141) 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, 1646570 + ... + 1646883.

It is an arithmetic number, because the mean of its divisors is an integer number (130091433).

Almost surely, 2^517072121 is an apocalyptic number.

It is an amenable number.

517072121 is a deficient number, since it is larger than the sum of its proper divisors (3293611).

517072121 is a wasteful number, since it uses less digits than its factorization.

517072121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293610.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 517072121 is about 22739.2198854754. The cubic root of 517072121 is about 802.6330539633.

The spelling of 517072121 in words is "five hundred seventeen million, seventy-two thousand, one hundred twenty-one".