509860991 has 8 divisors (see below), whose sum is σ = 568266480. Its totient is φ = 454612608.

The previous prime is 509860979. The next prime is 509861017. The reversal of 509860991 is 199068905.

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 509860991 - 2¹⁸ = 509598847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509860921) 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, 788936 + ... + 789581.

It is an arithmetic number, because the mean of its divisors is an integer number (71033310).

Almost surely, 2^509860991 is an apocalyptic number.

509860991 is a deficient number, since it is larger than the sum of its proper divisors (58405489).

509860991 is a wasteful number, since it uses less digits than its factorization.

509860991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578553.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 509860991 is about 22580.1016605329. The cubic root of 509860991 is about 798.8843777695.

The spelling of 509860991 in words is "five hundred nine million, eight hundred sixty thousand, nine hundred ninety-one".