30889961 has 4 divisors (see below), whose sum is σ = 30930900. Its totient is φ = 30849024.

The previous prime is 30889939. The next prime is 30889987. The reversal of 30889961 is 16998803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16998803 = 43 ⋅395321.

It can be written as a sum of positive squares in 2 ways, for example, as 23464336 + 7425625 = 4844^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 30889961 - 2¹⁰ = 30888937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30889921) 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, 19316 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (7732725).

Almost surely, 2^30889961 is an apocalyptic number.

It is an amenable number.

30889961 is a deficient number, since it is larger than the sum of its proper divisors (40939).

30889961 is an equidigital number, since it uses as much as digits as its factorization.

30889961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40938.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 30889961 is about 5557.8737841013. The cubic root of 30889961 is about 313.7659316894.

The spelling of 30889961 in words is "thirty million, eight hundred eighty-nine thousand, nine hundred sixty-one".