509428881 has 12 divisors (see below), whose sum is σ = 792445108. Its totient is φ = 313494624.

The previous prime is 509428841. The next prime is 509428901. The reversal of 509428881 is 188824905.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 141134400 + 368294481 = 11880^2 + 19191^2 .

It is not a de Polignac number, because 509428881 - 2¹⁰ = 509427857 is a prime.

It is a super-2 number, since 2×509428881² = 519035569593824322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (509428841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2176930 + ... + 2177163.

Almost surely, 2^509428881 is an apocalyptic number.

It is an amenable number.

509428881 is a deficient number, since it is larger than the sum of its proper divisors (283016227).

509428881 is a wasteful number, since it uses less digits than its factorization.

509428881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354112 (or 4354109 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 509428881 is about 22570.5312520552. The cubic root of 509428881 is about 798.6586276782.

The spelling of 509428881 in words is "five hundred nine million, four hundred twenty-eight thousand, eight hundred eighty-one".