30289961 has 4 divisors (see below), whose sum is σ = 32619972. Its totient is φ = 27959952.

The previous prime is 30289921. The next prime is 30289969. The reversal of 30289961 is 16998203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16998203 = 1523 ⋅11161.

It can be written as a sum of positive squares in 2 ways, for example, as 14137600 + 16152361 = 3760^2 + 4019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30289961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30289969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1164986 + ... + 1165011.

It is an arithmetic number, because the mean of its divisors is an integer number (8154993).

Almost surely, 2^30289961 is an apocalyptic number.

It is an amenable number.

30289961 is a deficient number, since it is larger than the sum of its proper divisors (2330011).

30289961 is a wasteful number, since it uses less digits than its factorization.

30289961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330010.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 30289961 is about 5503.6316192129. The cubic root of 30289961 is about 311.7211272359.

The spelling of 30289961 in words is "thirty million, two hundred eighty-nine thousand, nine hundred sixty-one".