501038981 has 2 divisors, whose sum is σ = 501038982. Its totient is φ = 501038980.

The previous prime is 501038971. The next prime is 501039013. The reversal of 501038981 is 189830105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500237956 + 801025 = 22366^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 501038981 - 2¹⁴ = 501022597 is a prime.

It is a super-2 number, since 2×501038981² = 502080120963036722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501038971) 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, 250519490 + 250519491.

It is an arithmetic number, because the mean of its divisors is an integer number (250519491).

Almost surely, 2^501038981 is an apocalyptic number.

It is an amenable number.

501038981 is a deficient number, since it is larger than the sum of its proper divisors (1).

501038981 is an equidigital number, since it uses as much as digits as its factorization.

501038981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 501038981 is about 22383.9000399841. The cubic root of 501038981 is about 794.2499054739.

The spelling of 501038981 in words is "five hundred one million, thirty-eight thousand, nine hundred eighty-one".