30812881 has 8 divisors (see below), whose sum is σ = 33804000. Its totient is φ = 27853440.

The previous prime is 30812879. The next prime is 30812911. The reversal of 30812881 is 18821803.

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 30812881 - 2¹ = 30812879 is a prime.

It is a super-2 number, since 2×30812881² = 1898867271040322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30812581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5856 + ... + 9793.

It is an arithmetic number, because the mean of its divisors is an integer number (4225500).

Almost surely, 2^30812881 is an apocalyptic number.

It is an amenable number.

30812881 is a deficient number, since it is larger than the sum of its proper divisors (2991119).

30812881 is a wasteful number, since it uses less digits than its factorization.

30812881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15839.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 30812881 is about 5550.9351464415. The cubic root of 30812881 is about 313.5047333197.

The spelling of 30812881 in words is "thirty million, eight hundred twelve thousand, eight hundred eighty-one".