30138961 has 2 divisors, whose sum is σ = 30138962. Its totient is φ = 30138960.

The previous prime is 30138949. The next prime is 30138973. The reversal of 30138961 is 16983103.

It is a balanced prime because it is at equal distance from previous prime (30138949) and next prime (30138973).

It can be written as a sum of positive squares in only one way, i.e., 27888961 + 2250000 = 5281^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 30138961 - 2⁵ = 30138929 is a prime.

It is not a weakly prime, because it can be changed into another prime (30138931) 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 as a sum of consecutive naturals, namely, 15069480 + 15069481.

It is an arithmetic number, because the mean of its divisors is an integer number (15069481).

Almost surely, 2^30138961 is an apocalyptic number.

It is an amenable number.

30138961 is a deficient number, since it is larger than the sum of its proper divisors (1).

30138961 is an equidigital number, since it uses as much as digits as its factorization.

30138961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 30138961 is about 5489.8962649580. The cubic root of 30138961 is about 311.2022718921.

The spelling of 30138961 in words is "thirty million, one hundred thirty-eight thousand, nine hundred sixty-one".