509817149 has 4 divisors (see below), whose sum is σ = 531983136. Its totient is φ = 487651164.

The previous prime is 509817067. The next prime is 509817157. The reversal of 509817149 is 941718905.

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 not a de Polignac number, because 509817149 - 2¹² = 509813053 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 (509817179) 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, 11082959 + ... + 11083004.

It is an arithmetic number, because the mean of its divisors is an integer number (132995784).

Almost surely, 2^509817149 is an apocalyptic number.

It is an amenable number.

509817149 is a deficient number, since it is larger than the sum of its proper divisors (22165987).

509817149 is a wasteful number, since it uses less digits than its factorization.

509817149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22165986.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 509817149 is about 22579.1308291528. The cubic root of 509817149 is about 798.8614789183.

The spelling of 509817149 in words is "five hundred nine million, eight hundred seventeen thousand, one hundred forty-nine".