507985781 has 2 divisors, whose sum is σ = 507985782. Its totient is φ = 507985780.

The previous prime is 507985763. The next prime is 507985801. The reversal of 507985781 is 187589705.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268664881 + 239320900 = 16391^2 + 15470^2 .

It is a cyclic number.

It is not a de Polignac number, because 507985781 - 2¹⁸ = 507723637 is a prime.

It is a super-2 number, since 2×507985781² = 516099107396359922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (507982781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253992890 + 253992891.

It is an arithmetic number, because the mean of its divisors is an integer number (253992891).

Almost surely, 2^507985781 is an apocalyptic number.

It is an amenable number.

507985781 is a deficient number, since it is larger than the sum of its proper divisors (1).

507985781 is an equidigital number, since it uses as much as digits as its factorization.

507985781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 50.

The square root of 507985781 is about 22538.5399039068. The cubic root of 507985781 is about 797.9037730256.

The spelling of 507985781 in words is "five hundred seven million, nine hundred eighty-five thousand, seven hundred eighty-one".