138202891 has 2 divisors, whose sum is σ = 138202892. Its totient is φ = 138202890.

The previous prime is 138202847. The next prime is 138202921. The reversal of 138202891 is 198202831.

138202891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (198202831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138202891 - 2⁷ = 138202763 is a prime.

It is not a weakly prime, because it can be changed into another prime (138202811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69101445 + 69101446.

It is an arithmetic number, because the mean of its divisors is an integer number (69101446).

Almost surely, 2^138202891 is an apocalyptic number.

138202891 is a deficient number, since it is larger than the sum of its proper divisors (1).

138202891 is an equidigital number, since it uses as much as digits as its factorization.

138202891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 138202891 is about 11755.9725671677. The cubic root of 138202891 is about 517.0180547328.

The spelling of 138202891 in words is "one hundred thirty-eight million, two hundred two thousand, eight hundred ninety-one".