30885881 has 4 divisors (see below), whose sum is σ = 33261732. Its totient is φ = 28510032.

The previous prime is 30885859. The next prime is 30885893. The reversal of 30885881 is 18858803.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20748025 + 10137856 = 4555^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 30885881 - 2⁶ = 30885817 is a prime.

It is a super-2 number, since 2×30885881² = 1907875290292322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30885181) 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, 1187906 + ... + 1187931.

It is an arithmetic number, because the mean of its divisors is an integer number (8315433).

Almost surely, 2^30885881 is an apocalyptic number.

It is an amenable number.

30885881 is a deficient number, since it is larger than the sum of its proper divisors (2375851).

30885881 is a wasteful number, since it uses less digits than its factorization.

30885881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375850.

The product of its (nonzero) digits is 61440, while the sum is 41.

The square root of 30885881 is about 5557.5067251421. The cubic root of 30885881 is about 313.7521168304.

The spelling of 30885881 in words is "thirty million, eight hundred eighty-five thousand, eight hundred eighty-one".