511428221 has 8 divisors (see below), whose sum is σ = 546575040. Its totient is φ = 476843968.

The previous prime is 511428199. The next prime is 511428223. The reversal of 511428221 is 122824115.

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 511428221 - 2⁶ = 511428157 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 (511428223) 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, 138761 + ... + 142398.

It is an arithmetic number, because the mean of its divisors is an integer number (68321880).

Almost surely, 2^511428221 is an apocalyptic number.

It is an amenable number.

511428221 is a deficient number, since it is larger than the sum of its proper divisors (35146819).

511428221 is a wasteful number, since it uses less digits than its factorization.

511428221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281283.

The product of its digits is 1280, while the sum is 26.

The square root of 511428221 is about 22614.7788182861. The cubic root of 511428221 is about 799.7020875115.

The spelling of 511428221 in words is "five hundred eleven million, four hundred twenty-eight thousand, two hundred twenty-one".