138897571 has 2 divisors, whose sum is σ = 138897572. Its totient is φ = 138897570.

The previous prime is 138897553. The next prime is 138897589. The reversal of 138897571 is 175798831.

It is a balanced prime because it is at equal distance from previous prime (138897553) and next prime (138897589).

It is a cyclic number.

It is not a de Polignac number, because 138897571 - 2¹⁷ = 138766499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138897511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69448785 + 69448786.

It is an arithmetic number, because the mean of its divisors is an integer number (69448786).

Almost surely, 2^138897571 is an apocalyptic number.

138897571 is a deficient number, since it is larger than the sum of its proper divisors (1).

138897571 is an equidigital number, since it uses as much as digits as its factorization.

138897571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 49.

The square root of 138897571 is about 11785.4813647980. The cubic root of 138897571 is about 517.8828750359.

The spelling of 138897571 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, five hundred seventy-one".