517140921 has 8 divisors (see below), whose sum is σ = 752205024. Its totient is φ = 313418720.

The previous prime is 517140889. The next prime is 517140931. The reversal of 517140921 is 129041715.

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

It is a cyclic number.

It is not a de Polignac number, because 517140921 - 2⁵ = 517140889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (517140931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7835436 + ... + 7835501.

It is an arithmetic number, because the mean of its divisors is an integer number (94025628).

Almost surely, 2^517140921 is an apocalyptic number.

It is an amenable number.

517140921 is a deficient number, since it is larger than the sum of its proper divisors (235064103).

517140921 is a wasteful number, since it uses less digits than its factorization.

517140921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15670951.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 517140921 is about 22740.7326399129. The cubic root of 517140921 is about 802.6686509995.

The spelling of 517140921 in words is "five hundred seventeen million, one hundred forty thousand, nine hundred twenty-one".