509286981 has 16 divisors (see below), whose sum is σ = 797032064. Its totient is φ = 283155264.

The previous prime is 509286977. The next prime is 509286983. The reversal of 509286981 is 189682905.

It is a happy number.

It is not a de Polignac number, because 509286981 - 2² = 509286977 is a prime.

It is a super-2 number, since 2×509286981² = 518746458032188722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 509286981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509286983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326950 + ... + 328503.

It is an arithmetic number, because the mean of its divisors is an integer number (49814504).

Almost surely, 2^509286981 is an apocalyptic number.

It is an amenable number.

509286981 is a deficient number, since it is larger than the sum of its proper divisors (287745083).

509286981 is a wasteful number, since it uses less digits than its factorization.

509286981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655500.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 509286981 is about 22567.3875537245. The cubic root of 509286981 is about 798.5844660777.

The spelling of 509286981 in words is "five hundred nine million, two hundred eighty-six thousand, nine hundred eighty-one".