501555013 has 2 divisors, whose sum is σ = 501555014. Its totient is φ = 501555012.

The previous prime is 501555011. The next prime is 501555031. The reversal of 501555013 is 310555105.

Together with next prime (501555031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302829604 + 198725409 = 17402^2 + 14097^2 .

It is a cyclic number.

It is not a de Polignac number, because 501555013 - 2¹ = 501555011 is a prime.

Together with 501555011, 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 (501555011) 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, 250777506 + 250777507.

It is an arithmetic number, because the mean of its divisors is an integer number (250777507).

Almost surely, 2^501555013 is an apocalyptic number.

It is an amenable number.

501555013 is a deficient number, since it is larger than the sum of its proper divisors (1).

501555013 is an equidigital number, since it uses as much as digits as its factorization.

501555013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1875, while the sum is 25.

The square root of 501555013 is about 22395.4239299014. The cubic root of 501555013 is about 794.5224842256.

The spelling of 501555013 in words is "five hundred one million, five hundred fifty-five thousand, thirteen".