509777421 has 4 divisors (see below), whose sum is σ = 679703232. Its totient is φ = 339851612.

The previous prime is 509777407. The next prime is 509777431. The reversal of 509777421 is 124777905.

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 509777421 - 2⁷ = 509777293 is a prime.

It is a super-2 number, since 2×509777421² = 519746037922822482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509777431) 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, 84962901 + ... + 84962906.

It is an arithmetic number, because the mean of its divisors is an integer number (169925808).

Almost surely, 2^509777421 is an apocalyptic number.

It is an amenable number.

509777421 is a deficient number, since it is larger than the sum of its proper divisors (169925811).

509777421 is a wasteful number, since it uses less digits than its factorization.

509777421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169925810.

The product of its (nonzero) digits is 123480, while the sum is 42.

The square root of 509777421 is about 22578.2510615858. The cubic root of 509777421 is about 798.8407276919.

The spelling of 509777421 in words is "five hundred nine million, seven hundred seventy-seven thousand, four hundred twenty-one".