509187925901 has 2 divisors, whose sum is σ = 509187925902. Its totient is φ = 509187925900.

The previous prime is 509187925877. The next prime is 509187925903. The reversal of 509187925901 is 109529781905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440935840900 + 68252085001 = 664030^2 + 261251^2 .

It is a cyclic number.

It is not a de Polignac number, because 509187925901 - 2¹⁸ = 509187663757 is a prime.

Together with 509187925903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509187925903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254593962950 + 254593962951.

It is an arithmetic number, because the mean of its divisors is an integer number (254593962951).

Almost surely, 2^509187925901 is an apocalyptic number.

It is an amenable number.

509187925901 is a deficient number, since it is larger than the sum of its proper divisors (1).

509187925901 is an equidigital number, since it uses as much as digits as its factorization.

509187925901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 56.

The spelling of 509187925901 in words is "five hundred nine billion, one hundred eighty-seven million, nine hundred twenty-five thousand, nine hundred one".