501039961 has 2 divisors, whose sum is σ = 501039962. Its totient is φ = 501039960.

The previous prime is 501039857. The next prime is 501039991. The reversal of 501039961 is 169930105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500864400 + 175561 = 22380^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 501039961 - 2⁹ = 501039449 is a prime.

It is not a weakly prime, because it can be changed into another prime (501039991) 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, 250519980 + 250519981.

It is an arithmetic number, because the mean of its divisors is an integer number (250519981).

Almost surely, 2^501039961 is an apocalyptic number.

It is an amenable number.

501039961 is a deficient number, since it is larger than the sum of its proper divisors (1).

501039961 is an equidigital number, since it uses as much as digits as its factorization.

501039961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 501039961 is about 22383.9219307073. The cubic root of 501039961 is about 794.2504233074.

The spelling of 501039961 in words is "five hundred one million, thirty-nine thousand, nine hundred sixty-one".