138774871 has 2 divisors, whose sum is σ = 138774872. Its totient is φ = 138774870.

The previous prime is 138774869. The next prime is 138774943. The reversal of 138774871 is 178477831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138774871 - 2¹ = 138774869 is a prime.

Together with 138774869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138774851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69387435 + 69387436.

It is an arithmetic number, because the mean of its divisors is an integer number (69387436).

Almost surely, 2^138774871 is an apocalyptic number.

138774871 is a deficient number, since it is larger than the sum of its proper divisors (1).

138774871 is an equidigital number, since it uses as much as digits as its factorization.

138774871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 46.

The square root of 138774871 is about 11780.2746572395. The cubic root of 138774871 is about 517.7303334932.

The spelling of 138774871 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred seventy-one".