30981149 has 2 divisors, whose sum is σ = 30981150. Its totient is φ = 30981148.

The previous prime is 30981133. The next prime is 30981151. The reversal of 30981149 is 94118903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22629049 + 8352100 = 4757^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 30981149 - 2⁴ = 30981133 is a prime.

Together with 30981151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30981109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15490574 + 15490575.

It is an arithmetic number, because the mean of its divisors is an integer number (15490575).

Almost surely, 2^30981149 is an apocalyptic number.

It is an amenable number.

30981149 is a deficient number, since it is larger than the sum of its proper divisors (1).

30981149 is an equidigital number, since it uses as much as digits as its factorization.

30981149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 30981149 is about 5566.0712356203. The cubic root of 30981149 is about 314.0743768798.

The spelling of 30981149 in words is "thirty million, nine hundred eighty-one thousand, one hundred forty-nine".