138357697 has 2 divisors, whose sum is σ = 138357698. Its totient is φ = 138357696.

The previous prime is 138357691. The next prime is 138357721. The reversal of 138357697 is 796753831.

138357697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127328656 + 11029041 = 11284^2 + 3321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138357697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138357697.

It is not a weakly prime, because it can be changed into another prime (138357691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69178848 + 69178849.

It is an arithmetic number, because the mean of its divisors is an integer number (69178849).

Almost surely, 2^138357697 is an apocalyptic number.

It is an amenable number.

138357697 is a deficient number, since it is larger than the sum of its proper divisors (1).

138357697 is an equidigital number, since it uses as much as digits as its factorization.

138357697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The square root of 138357697 is about 11762.5548670346. The cubic root of 138357697 is about 517.2110261694.

The spelling of 138357697 in words is "one hundred thirty-eight million, three hundred fifty-seven thousand, six hundred ninety-seven".