138680251 has 2 divisors, whose sum is σ = 138680252. Its totient is φ = 138680250.

The previous prime is 138680231. The next prime is 138680257. The reversal of 138680251 is 152086831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138680251 - 2¹⁷ = 138549179 is a prime.

It is not a weakly prime, because it can be changed into another prime (138680257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69340125 + 69340126.

It is an arithmetic number, because the mean of its divisors is an integer number (69340126).

Almost surely, 2^138680251 is an apocalyptic number.

138680251 is a deficient number, since it is larger than the sum of its proper divisors (1).

138680251 is an equidigital number, since it uses as much as digits as its factorization.

138680251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 138680251 is about 11776.2579370528. The cubic root of 138680251 is about 517.6126397982.

The spelling of 138680251 in words is "one hundred thirty-eight million, six hundred eighty thousand, two hundred fifty-one".