509970391 has 6 divisors (see below), whose sum is σ = 593230920. Its totient is φ = 437117436.

The previous prime is 509970379. The next prime is 509970397. The reversal of 509970391 is 193079905.

It is not a de Polignac number, because 509970391 - 2⁹ = 509969879 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 (509970397) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5203731 + ... + 5203828.

It is an arithmetic number, because the mean of its divisors is an integer number (98871820).

Almost surely, 2^509970391 is an apocalyptic number.

509970391 is a deficient number, since it is larger than the sum of its proper divisors (83260529).

509970391 is a wasteful number, since it uses less digits than its factorization.

509970391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10407573 (or 10407566 counting only the distinct ones).

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 509970391 is about 22582.5240174786. The cubic root of 509970391 is about 798.9415121010.

The spelling of 509970391 in words is "five hundred nine million, nine hundred seventy thousand, three hundred ninety-one".