102138871 has 2 divisors, whose sum is σ = 102138872. Its totient is φ = 102138870.

The previous prime is 102138859. The next prime is 102138901. The reversal of 102138871 is 178831201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102138871 - 2¹¹ = 102136823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102138821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069435 + 51069436.

It is an arithmetic number, because the mean of its divisors is an integer number (51069436).

Almost surely, 2^102138871 is an apocalyptic number.

102138871 is a deficient number, since it is larger than the sum of its proper divisors (1).

102138871 is an equidigital number, since it uses as much as digits as its factorization.

102138871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 102138871 is about 10106.3777388340. The cubic root of 102138871 is about 467.4448194759. Note that the first 3 decimals are identical.

The spelling of 102138871 in words is "one hundred two million, one hundred thirty-eight thousand, eight hundred seventy-one".