509849251 has 2 divisors, whose sum is σ = 509849252. Its totient is φ = 509849250.

The previous prime is 509849239. The next prime is 509849299. The reversal of 509849251 is 152948905.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509849251 is a prime.

It is a super-2 number, since 2×509849251² = 519892517490522002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 509849198 and 509849207.

It is not a weakly prime, because it can be changed into another prime (509849201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254924625 + 254924626.

It is an arithmetic number, because the mean of its divisors is an integer number (254924626).

Almost surely, 2^509849251 is an apocalyptic number.

509849251 is a deficient number, since it is larger than the sum of its proper divisors (1).

509849251 is an equidigital number, since it uses as much as digits as its factorization.

509849251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 509849251 is about 22579.8416956364. The cubic root of 509849251 is about 798.8782460494.

The spelling of 509849251 in words is "five hundred nine million, eight hundred forty-nine thousand, two hundred fifty-one".