501259961 has 2 divisors, whose sum is σ = 501259962. Its totient is φ = 501259960.

The previous prime is 501259951. The next prime is 501259963. The reversal of 501259961 is 169952105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473497600 + 27762361 = 21760^2 + 5269^2 .

It is a cyclic number.

It is not a de Polignac number, because 501259961 - 2¹⁰ = 501258937 is a prime.

Together with 501259963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (501259963) 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, 250629980 + 250629981.

It is an arithmetic number, because the mean of its divisors is an integer number (250629981).

Almost surely, 2^501259961 is an apocalyptic number.

It is an amenable number.

501259961 is a deficient number, since it is larger than the sum of its proper divisors (1).

501259961 is an equidigital number, since it uses as much as digits as its factorization.

501259961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 501259961 is about 22388.8356329667. The cubic root of 501259961 is about 794.3666545720.

The spelling of 501259961 in words is "five hundred one million, two hundred fifty-nine thousand, nine hundred sixty-one".