30881009 has 4 divisors (see below), whose sum is σ = 31599216. Its totient is φ = 30162804.

The previous prime is 30881003. The next prime is 30881029. The reversal of 30881009 is 90018803.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30881009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30881003) 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, 359039 + ... + 359124.

It is an arithmetic number, because the mean of its divisors is an integer number (7899804).

Almost surely, 2^30881009 is an apocalyptic number.

It is an amenable number.

30881009 is a deficient number, since it is larger than the sum of its proper divisors (718207).

30881009 is an equidigital number, since it uses as much as digits as its factorization.

30881009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718206.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 30881009 is about 5557.0683817999. The cubic root of 30881009 is about 313.7356186696.

The spelling of 30881009 in words is "thirty million, eight hundred eighty-one thousand, nine".