2178148393 has 2 divisors, whose sum is σ = 2178148394. Its totient is φ = 2178148392.

The previous prime is 2178148361. The next prime is 2178148439. The reversal of 2178148393 is 3938418712.

It is an a-pointer prime, because the next prime (2178148439) can be obtained adding 2178148393 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1613468224 + 564680169 = 40168^2 + 23763^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178148393 - 2⁵ = 2178148361 is a prime.

It is not a weakly prime, because it can be changed into another prime (2178143393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089074196 + 1089074197.

It is an arithmetic number, because the mean of its divisors is an integer number (1089074197).

Almost surely, 2^2178148393 is an apocalyptic number.

It is an amenable number.

2178148393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178148393 is an equidigital number, since it uses as much as digits as its factorization.

2178148393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 2178148393 is about 46670.6373751206. The cubic root of 2178148393 is about 1296.2710483308.

The spelling of 2178148393 in words is "two billion, one hundred seventy-eight million, one hundred forty-eight thousand, three hundred ninety-three".