505244009 has 2 divisors, whose sum is σ = 505244010. Its totient is φ = 505244008.

The previous prime is 505243933. The next prime is 505244021. The reversal of 505244009 is 900442505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358155625 + 147088384 = 18925^2 + 12128^2 .

It is a cyclic number.

It is not a de Polignac number, because 505244009 - 2¹² = 505239913 is a prime.

It is equal to p_26617070 and since 505244009 and 26617070 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (505244039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252622004 + 252622005.

It is an arithmetic number, because the mean of its divisors is an integer number (252622005).

Almost surely, 2^505244009 is an apocalyptic number.

It is an amenable number.

505244009 is a deficient number, since it is larger than the sum of its proper divisors (1).

505244009 is an equidigital number, since it uses as much as digits as its factorization.

505244009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 505244009 is about 22477.6335275758. The cubic root of 505244009 is about 796.4656632617.

The spelling of 505244009 in words is "five hundred five million, two hundred forty-four thousand, nine".