2138655193 has 2 divisors, whose sum is σ = 2138655194. Its totient is φ = 2138655192.

The previous prime is 2138655173. The next prime is 2138655203. The reversal of 2138655193 is 3915568312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1972425744 + 166229449 = 44412^2 + 12893^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138655193 - 2⁹ = 2138654681 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138655163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069327596 + 1069327597.

It is an arithmetic number, because the mean of its divisors is an integer number (1069327597).

Almost surely, 2^2138655193 is an apocalyptic number.

It is an amenable number.

2138655193 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138655193 is an equidigital number, since it uses as much as digits as its factorization.

2138655193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 2138655193 is about 46245.5964714480. The cubic root of 2138655193 is about 1288.3887487044.

The spelling of 2138655193 in words is "two billion, one hundred thirty-eight million, six hundred fifty-five thousand, one hundred ninety-three".