30999999 has 4 divisors (see below), whose sum is σ = 41333336. Its totient is φ = 20666664.

The previous prime is 30999989. The next prime is 31000003. The reversal of 30999999 is 99999903.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 30999999 - 2¹² = 30995903 is a prime.

It is a Duffinian number.

30999999 is a modest number, since divided by 9999 gives 3099 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30999979) 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, 5166664 + ... + 5166669.

It is an arithmetic number, because the mean of its divisors is an integer number (10333334).

Almost surely, 2^30999999 is an apocalyptic number.

30999999 is a deficient number, since it is larger than the sum of its proper divisors (10333337).

30999999 is a wasteful number, since it uses less digits than its factorization.

30999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333336.

The product of its (nonzero) digits is 1594323, while the sum is 57.

The square root of 30999999 is about 5567.7642730274. The cubic root of 30999999 is about 314.1380618613.

The spelling of 30999999 in words is "thirty million, nine hundred ninety-nine thousand, nine hundred ninety-nine".