509898971 has 2 divisors, whose sum is σ = 509898972. Its totient is φ = 509898970.

The previous prime is 509898931. The next prime is 509898973. The reversal of 509898971 is 179898905.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509898971 is a prime.

Together with 509898973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (509898973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254949485 + 254949486.

It is an arithmetic number, because the mean of its divisors is an integer number (254949486).

Almost surely, 2^509898971 is an apocalyptic number.

509898971 is a deficient number, since it is larger than the sum of its proper divisors (1).

509898971 is an equidigital number, since it uses as much as digits as its factorization.

509898971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 509898971 is about 22580.9426508284. The cubic root of 509898971 is about 798.9042138136.

The spelling of 509898971 in words is "five hundred nine million, eight hundred ninety-eight thousand, nine hundred seventy-one".