30949881 has 16 divisors (see below), whose sum is σ = 43350144. Its totient is φ = 19603584.

The previous prime is 30949859. The next prime is 30949903. The reversal of 30949881 is 18894903.

It is an interprime number because it is at equal distance from previous prime (30949859) and next prime (30949903).

It is not a de Polignac number, because 30949881 - 2²¹ = 28852729 is a prime.

It is a super-2 number, since 2×30949881² = 1915790267828322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30949481) 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 15 ways as a sum of consecutive naturals, for example, 9405 + ... + 12261.

It is an arithmetic number, because the mean of its divisors is an integer number (2709384).

Almost surely, 2^30949881 is an apocalyptic number.

It is an amenable number.

30949881 is a deficient number, since it is larger than the sum of its proper divisors (12400263).

30949881 is a wasteful number, since it uses less digits than its factorization.

30949881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 30949881 is about 5563.2617231261. The cubic root of 30949881 is about 313.9686805280.

The spelling of 30949881 in words is "thirty million, nine hundred forty-nine thousand, eight hundred eighty-one".