30120917 has 2 divisors, whose sum is σ = 30120918. Its totient is φ = 30120916.

The previous prime is 30120887. The next prime is 30120919. The reversal of 30120917 is 71902103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24196561 + 5924356 = 4919^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 30120917 - 2¹⁴ = 30104533 is a prime.

Together with 30120919, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30120892 and 30120901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30120919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060458 + 15060459.

It is an arithmetic number, because the mean of its divisors is an integer number (15060459).

Almost surely, 2^30120917 is an apocalyptic number.

It is an amenable number.

30120917 is a deficient number, since it is larger than the sum of its proper divisors (1).

30120917 is an equidigital number, since it uses as much as digits as its factorization.

30120917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 30120917 is about 5488.2526363133. The cubic root of 30120917 is about 311.1401545684.

The spelling of 30120917 in words is "thirty million, one hundred twenty thousand, nine hundred seventeen".