138601481 has 2 divisors, whose sum is σ = 138601482. Its totient is φ = 138601480.

The previous prime is 138601417. The next prime is 138601499. The reversal of 138601481 is 184106831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115369081 + 23232400 = 10741^2 + 4820^2 .

It is a cyclic number.

It is not a de Polignac number, because 138601481 - 2⁶ = 138601417 is a prime.

It is a super-2 number, since 2×138601481² = 38420741070786722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138601081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69300740 + 69300741.

It is an arithmetic number, because the mean of its divisors is an integer number (69300741).

Almost surely, 2^138601481 is an apocalyptic number.

It is an amenable number.

138601481 is a deficient number, since it is larger than the sum of its proper divisors (1).

138601481 is an equidigital number, since it uses as much as digits as its factorization.

138601481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 138601481 is about 11772.9130209987. The cubic root of 138601481 is about 517.5146203871.

The spelling of 138601481 in words is "one hundred thirty-eight million, six hundred one thousand, four hundred eighty-one".