30881811 has 8 divisors (see below), whose sum is σ = 41697280. Its totient is φ = 20327112.

The previous prime is 30881803. The next prime is 30881813. The reversal of 30881811 is 11818803.

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

It is not a de Polignac number, because 30881811 - 2³ = 30881803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30881813) 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, 64915 + ... + 65388.

It is an arithmetic number, because the mean of its divisors is an integer number (5212160).

Almost surely, 2^30881811 is an apocalyptic number.

30881811 is a deficient number, since it is larger than the sum of its proper divisors (10815469).

30881811 is a wasteful number, since it uses less digits than its factorization.

30881811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130385.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 30881811 is about 5557.1405416815. The cubic root of 30881811 is about 313.7383346192.

The spelling of 30881811 in words is "thirty million, eight hundred eighty-one thousand, eight hundred eleven".