138498497 has 2 divisors, whose sum is σ = 138498498. Its totient is φ = 138498496.

The previous prime is 138498427. The next prime is 138498509. The reversal of 138498497 is 794894831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97140736 + 41357761 = 9856^2 + 6431^2 .

It is a cyclic number.

It is not a de Polignac number, because 138498497 - 2²² = 134304193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138498407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69249248 + 69249249.

It is an arithmetic number, because the mean of its divisors is an integer number (69249249).

Almost surely, 2^138498497 is an apocalyptic number.

It is an amenable number.

138498497 is a deficient number, since it is larger than the sum of its proper divisors (1).

138498497 is an equidigital number, since it uses as much as digits as its factorization.

138498497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 138498497 is about 11768.5384394155. The cubic root of 138498497 is about 517.3864136496.

The spelling of 138498497 in words is "one hundred thirty-eight million, four hundred ninety-eight thousand, four hundred ninety-seven".