138171497 has 2 divisors, whose sum is σ = 138171498. Its totient is φ = 138171496.

The previous prime is 138171491. The next prime is 138171547. The reversal of 138171497 is 794171831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138039001 + 132496 = 11749^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 138171497 - 2¹⁴ = 138155113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138171491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69085748 + 69085749.

It is an arithmetic number, because the mean of its divisors is an integer number (69085749).

Almost surely, 2^138171497 is an apocalyptic number.

It is an amenable number.

138171497 is a deficient number, since it is larger than the sum of its proper divisors (1).

138171497 is an equidigital number, since it uses as much as digits as its factorization.

138171497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 41.

The square root of 138171497 is about 11754.6372551432. The cubic root of 138171497 is about 516.9789033714.

The spelling of 138171497 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, four hundred ninety-seven".