501221507 has 2 divisors, whose sum is σ = 501221508. Its totient is φ = 501221506.

The previous prime is 501221453. The next prime is 501221509. The reversal of 501221507 is 705122105.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 501221507 - 2¹⁸ = 500959363 is a prime.

Together with 501221509, 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 (501221509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250610753 + 250610754.

It is an arithmetic number, because the mean of its divisors is an integer number (250610754).

Almost surely, 2^501221507 is an apocalyptic number.

501221507 is a deficient number, since it is larger than the sum of its proper divisors (1).

501221507 is an equidigital number, since it uses as much as digits as its factorization.

501221507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 501221507 is about 22387.9768402596. The cubic root of 501221507 is about 794.3463408566.

The spelling of 501221507 in words is "five hundred one million, two hundred twenty-one thousand, five hundred seven".