501039509 has 2 divisors, whose sum is σ = 501039510. Its totient is φ = 501039508.

The previous prime is 501039503. The next prime is 501039523. The reversal of 501039509 is 905930105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290702500 + 210337009 = 17050^2 + 14503^2 .

It is a cyclic number.

It is not a de Polignac number, because 501039509 - 2¹² = 501035413 is a prime.

It is a super-2 number, since 2×501039509² = 502081179157922162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501039503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250519754 + 250519755.

It is an arithmetic number, because the mean of its divisors is an integer number (250519755).

Almost surely, 2^501039509 is an apocalyptic number.

It is an amenable number.

501039509 is a deficient number, since it is larger than the sum of its proper divisors (1).

501039509 is an equidigital number, since it uses as much as digits as its factorization.

501039509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 501039509 is about 22383.9118341723. The cubic root of 501039509 is about 794.2501844700.

The spelling of 501039509 in words is "five hundred one million, thirty-nine thousand, five hundred nine".