501720709 has 16 divisors (see below), whose sum is σ = 593443840. Its totient is φ = 415082880.

The previous prime is 501720691. The next prime is 501720721. The reversal of 501720709 is 907027105.

It is a cyclic number.

It is not a de Polignac number, because 501720709 - 2⁷ = 501720581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501720799) 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 in 15 ways as a sum of consecutive naturals, for example, 85927 + ... + 91579.

It is an arithmetic number, because the mean of its divisors is an integer number (37090240).

Almost surely, 2^501720709 is an apocalyptic number.

It is an amenable number.

501720709 is a deficient number, since it is larger than the sum of its proper divisors (91723131).

501720709 is a wasteful number, since it uses less digits than its factorization.

501720709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6100.

The product of its (nonzero) digits is 4410, while the sum is 31.

The square root of 501720709 is about 22399.1229515800. The cubic root of 501720709 is about 794.6099686154.

The spelling of 501720709 in words is "five hundred one million, seven hundred twenty thousand, seven hundred nine".