30919899 has 4 divisors (see below), whose sum is σ = 41226536. Its totient is φ = 20613264.

The previous prime is 30919891. The next prime is 30919939. The reversal of 30919899 is 99891903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99891903 = 3 ⋅33297301.

It is not a de Polignac number, because 30919899 - 2³ = 30919891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30919891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5153314 + ... + 5153319.

It is an arithmetic number, because the mean of its divisors is an integer number (10306634).

Almost surely, 2^30919899 is an apocalyptic number.

30919899 is a deficient number, since it is larger than the sum of its proper divisors (10306637).

30919899 is a wasteful number, since it uses less digits than its factorization.

30919899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306636.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 30919899 is about 5560.5664279820. The cubic root of 30919899 is about 313.8672644106.

The spelling of 30919899 in words is "thirty million, nine hundred nineteen thousand, eight hundred ninety-nine".