30312209 has 8 divisors (see below), whose sum is σ = 30861768. Its totient is φ = 29767680.

The previous prime is 30312199. The next prime is 30312211. The reversal of 30312209 is 90221303.

It can be written as a sum of positive squares in 4 ways, for example, as 6027025 + 24285184 = 2455^2 + 4928^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30312209 - 2²⁴ = 13534993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30312299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12149 + ... + 14429.

It is an arithmetic number, because the mean of its divisors is an integer number (3857721).

Almost surely, 2^30312209 is an apocalyptic number.

It is an amenable number.

30312209 is a deficient number, since it is larger than the sum of its proper divisors (549559).

30312209 is a wasteful number, since it uses less digits than its factorization.

30312209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 30312209 is about 5505.6524590642. The cubic root of 30312209 is about 311.7974283616.

The spelling of 30312209 in words is "thirty million, three hundred twelve thousand, two hundred nine".