138687097 has 2 divisors, whose sum is σ = 138687098. Its totient is φ = 138687096.

The previous prime is 138686983. The next prime is 138687103. The reversal of 138687097 is 790786831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132457081 + 6230016 = 11509^2 + 2496^2 .

It is a cyclic number.

It is not a de Polignac number, because 138687097 - 2¹⁹ = 138162809 is a prime.

It is a super-2 number, since 2×138687097² = 38468221748574818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138687097.

It is not a weakly prime, because it can be changed into another prime (138681097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69343548 + 69343549.

It is an arithmetic number, because the mean of its divisors is an integer number (69343549).

Almost surely, 2^138687097 is an apocalyptic number.

It is an amenable number.

138687097 is a deficient number, since it is larger than the sum of its proper divisors (1).

138687097 is an equidigital number, since it uses as much as digits as its factorization.

138687097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 138687097 is about 11776.5486030500. The cubic root of 138687097 is about 517.6211570355.

The spelling of 138687097 in words is "one hundred thirty-eight million, six hundred eighty-seven thousand, ninety-seven".