138558097 has 2 divisors, whose sum is σ = 138558098. Its totient is φ = 138558096.

The previous prime is 138558071. The next prime is 138558103. The reversal of 138558097 is 790855831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125081856 + 13476241 = 11184^2 + 3671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138558097 is a prime.

It is a super-2 number, since 2×138558097² = 38396692488522818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138558037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69279048 + 69279049.

It is an arithmetic number, because the mean of its divisors is an integer number (69279049).

Almost surely, 2^138558097 is an apocalyptic number.

It is an amenable number.

138558097 is a deficient number, since it is larger than the sum of its proper divisors (1).

138558097 is an equidigital number, since it uses as much as digits as its factorization.

138558097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 46.

The square root of 138558097 is about 11771.0703421567. The cubic root of 138558097 is about 517.4606185657.

It can be divided in two parts, 13855 and 8097, that added together give a cube (21952 = 28³).

The spelling of 138558097 in words is "one hundred thirty-eight million, five hundred fifty-eight thousand, ninety-seven".