30188020009 has 9 divisors (see below), whose sum is σ = 35118091191. Its totient is φ = 25874403240.

The previous prime is 30188019949. The next prime is 30188020013. The reversal of 30188020009 is 90002088103.

The square root of 30188020009 is 173747.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3950499609 + 26237520400 = 62853^2 + 161980^2 .

It is not a de Polignac number, because 30188020009 - 2⁷ = 30188019881 is a prime.

It is a super-2 number, since 2×30188020009² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30188020609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1203819 + ... + 1228639.

Almost surely, 2^30188020009 is an apocalyptic number.

30188020009 is the 173747-th square number.

30188020009 is the 86874-th centered octagonal number.

It is an amenable number.

30188020009 is a deficient number, since it is larger than the sum of its proper divisors (4930071182).

30188020009 is an frugal number, since it uses more digits than its factorization.

30188020009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49656 (or 24828 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 30188020009 in words is "thirty billion, one hundred eighty-eight million, twenty thousand, nine".