509898973 has 2 divisors, whose sum is σ = 509898974. Its totient is φ = 509898972.

The previous prime is 509898971. The next prime is 509898979. The reversal of 509898973 is 379898905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499388409 + 10510564 = 22347^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 509898973 - 2¹ = 509898971 is a prime.

Together with 509898971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509898971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254949486 + 254949487.

It is an arithmetic number, because the mean of its divisors is an integer number (254949487).

Almost surely, 2^509898973 is an apocalyptic number.

It is an amenable number.

509898973 is a deficient number, since it is larger than the sum of its proper divisors (1).

509898973 is an equidigital number, since it uses as much as digits as its factorization.

509898973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The square root of 509898973 is about 22580.9426951135. The cubic root of 509898973 is about 798.9042148581.

The spelling of 509898973 in words is "five hundred nine million, eight hundred ninety-eight thousand, nine hundred seventy-three".