509017121 has 4 divisors (see below), whose sum is σ = 510654144. Its totient is φ = 507380100.

The previous prime is 509017081. The next prime is 509017127. The reversal of 509017121 is 121710905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509017121 is a prime.

It is a super-2 number, since 2×509017121² = 518196858942257282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509017127) 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, 818045 + ... + 818666.

It is an arithmetic number, because the mean of its divisors is an integer number (127663536).

Almost surely, 2^509017121 is an apocalyptic number.

It is an amenable number.

509017121 is a deficient number, since it is larger than the sum of its proper divisors (1637023).

509017121 is a wasteful number, since it uses less digits than its factorization.

509017121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637022.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 509017121 is about 22561.4077796577. The cubic root of 509017121 is about 798.4433903600.

The spelling of 509017121 in words is "five hundred nine million, seventeen thousand, one hundred twenty-one".