30131009 has 4 divisors (see below), whose sum is σ = 30143316. Its totient is φ = 30118704.

The previous prime is 30130999. The next prime is 30131033. The reversal of 30131009 is 90013103.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 8832784 = 4615^2 + 2972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30131009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30131069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (7535829).

Almost surely, 2^30131009 is an apocalyptic number.

It is an amenable number.

30131009 is a deficient number, since it is larger than the sum of its proper divisors (12307).

30131009 is an equidigital number, since it uses as much as digits as its factorization.

30131009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12306.

The product of its (nonzero) digits is 81, while the sum is 17.

The square root of 30131009 is about 5489.1719776301. The cubic root of 30131009 is about 311.1748998123.

The spelling of 30131009 in words is "thirty million, one hundred thirty-one thousand, nine".