138591097 has 2 divisors, whose sum is σ = 138591098. Its totient is φ = 138591096.

The previous prime is 138591091. The next prime is 138591113. The reversal of 138591097 is 790195831.

138591097 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., 121418361 + 17172736 = 11019^2 + 4144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138591097 is a prime.

It is equal to p_7836982 and since 138591097 and 7836982 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138591091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69295548 + 69295549.

It is an arithmetic number, because the mean of its divisors is an integer number (69295549).

Almost surely, 2^138591097 is an apocalyptic number.

It is an amenable number.

138591097 is a deficient number, since it is larger than the sum of its proper divisors (1).

138591097 is an equidigital number, since it uses as much as digits as its factorization.

138591097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 138591097 is about 11772.4720003914. The cubic root of 138591097 is about 517.5016960278.

The spelling of 138591097 in words is "one hundred thirty-eight million, five hundred ninety-one thousand, ninety-seven".