501666929 has 2 divisors, whose sum is σ = 501666930. Its totient is φ = 501666928.

The previous prime is 501666887. The next prime is 501666931. The reversal of 501666929 is 929666105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388287025 + 113379904 = 19705^2 + 10648^2 .

It is a cyclic number.

It is not a de Polignac number, because 501666929 - 2¹⁶ = 501601393 is a prime.

Together with 501666931, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 501666929.

It is not a weakly prime, because it can be changed into another prime (501666229) 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, 250833464 + 250833465.

It is an arithmetic number, because the mean of its divisors is an integer number (250833465).

Almost surely, 2^501666929 is an apocalyptic number.

It is an amenable number.

501666929 is a deficient number, since it is larger than the sum of its proper divisors (1).

501666929 is an equidigital number, since it uses as much as digits as its factorization.

501666929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 501666929 is about 22397.9224259751. The cubic root of 501666929 is about 794.5815758926.

The spelling of 501666929 in words is "five hundred one million, six hundred sixty-six thousand, nine hundred twenty-nine".