30121873 has 2 divisors, whose sum is σ = 30121874. Its totient is φ = 30121872.

The previous prime is 30121853. The next prime is 30121879. The reversal of 30121873 is 37812103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 1306449 = 5368^2 + 1143^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121873 - 2⁹ = 30121361 is a prime.

It is not a weakly prime, because it can be changed into another prime (30121879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060936 + 15060937.

It is an arithmetic number, because the mean of its divisors is an integer number (15060937).

Almost surely, 2^30121873 is an apocalyptic number.

It is an amenable number.

30121873 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121873 is an equidigital number, since it uses as much as digits as its factorization.

30121873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 30121873 is about 5488.3397307382. The cubic root of 30121873 is about 311.1434462659.

Adding to 30121873 its reverse (37812103), we get a palindrome (67933976).

The spelling of 30121873 in words is "thirty million, one hundred twenty-one thousand, eight hundred seventy-three".