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30219913 is a prime number
BaseRepresentation
bin111001101000…
…1111010001001
32002212022221001
41303101322021
530214014123
62555415001
7514602463
oct163217211
962768831
1030219913
1116070739
12a154461
136351109
144029133
hex1cd1e89

30219913 has 2 divisors, whose sum is σ = 30219914. Its totient is φ = 30219912.

The previous prime is 30219901. The next prime is 30219971. The reversal of 30219913 is 31991203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25674489 + 4545424 = 5067^2 + 2132^2 .

It is an emirp because it is prime and its reverse (31991203) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-30219913 is a prime.

It is not a weakly prime, because it can be changed into another prime (30219983) 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, 15109956 + 15109957.

It is an arithmetic number, because the mean of its divisors is an integer number (15109957).

Almost surely, 230219913 is an apocalyptic number.

It is an amenable number.

30219913 is a deficient number, since it is larger than the sum of its proper divisors (1).

30219913 is an equidigital number, since it uses as much as digits as its factorization.

30219913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 30219913 is about 5497.2641377325. The cubic root of 30219913 is about 311.4806482726.

The spelling of 30219913 in words is "thirty million, two hundred nineteen thousand, nine hundred thirteen".