500428781 has 2 divisors, whose sum is σ = 500428782. Its totient is φ = 500428780.

The previous prime is 500428769. The next prime is 500428801. The reversal of 500428781 is 187824005.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500416900 + 11881 = 22370^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 500428781 - 2⁶ = 500428717 is a prime.

It is a super-2 number, since 2×500428781² = 500857929706291922, 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 (500428741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250214390 + 250214391.

It is an arithmetic number, because the mean of its divisors is an integer number (250214391).

Almost surely, 2^500428781 is an apocalyptic number.

It is an amenable number.

500428781 is a deficient number, since it is larger than the sum of its proper divisors (1).

500428781 is an equidigital number, since it uses as much as digits as its factorization.

500428781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 500428781 is about 22370.2655549727. The cubic root of 500428781 is about 793.9273436299.

The spelling of 500428781 in words is "five hundred million, four hundred twenty-eight thousand, seven hundred eighty-one".