30878149 has 2 divisors, whose sum is σ = 30878150. Its totient is φ = 30878148.

The previous prime is 30878147. The next prime is 30878161. The reversal of 30878149 is 94187803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25070049 + 5808100 = 5007^2 + 2410^2 .

It is a cyclic number.

It is not a de Polignac number, because 30878149 - 2¹ = 30878147 is a prime.

Together with 30878147, 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 (30878143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15439074 + 15439075.

It is an arithmetic number, because the mean of its divisors is an integer number (15439075).

Almost surely, 2^30878149 is an apocalyptic number.

It is an amenable number.

30878149 is a deficient number, since it is larger than the sum of its proper divisors (1).

30878149 is an equidigital number, since it uses as much as digits as its factorization.

30878149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 30878149 is about 5556.8110459147. The cubic root of 30878149 is about 313.7259329804.

It can be divided in two parts, 3087 and 8149, that added together give a square (11236 = 106²).

The spelling of 30878149 in words is "thirty million, eight hundred seventy-eight thousand, one hundred forty-nine".