201520024009 has 2 divisors, whose sum is σ = 201520024010. Its totient is φ = 201520024008.

The previous prime is 201520024001. The next prime is 201520024019. The reversal of 201520024009 is 900420025102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181063015225 + 20457008784 = 425515^2 + 143028^2 .

It is a cyclic number.

It is not a de Polignac number, because 201520024009 - 2³ = 201520024001 is a prime.

It is a super-2 number, since 2×201520024009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201520024001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100760012004 + 100760012005.

It is an arithmetic number, because the mean of its divisors is an integer number (100760012005).

Almost surely, 2^201520024009 is an apocalyptic number.

It is an amenable number.

201520024009 is a deficient number, since it is larger than the sum of its proper divisors (1).

201520024009 is an equidigital number, since it uses as much as digits as its factorization.

201520024009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 201520024009 in words is "two hundred one billion, five hundred twenty million, twenty-four thousand, nine".