138870541 has 2 divisors, whose sum is σ = 138870542. Its totient is φ = 138870540.

The previous prime is 138870539. The next prime is 138870577. The reversal of 138870541 is 145078831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138156516 + 714025 = 11754^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 138870541 - 2¹ = 138870539 is a prime.

Together with 138870539, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 138870541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138871541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69435270 + 69435271.

It is an arithmetic number, because the mean of its divisors is an integer number (69435271).

Almost surely, 2^138870541 is an apocalyptic number.

It is an amenable number.

138870541 is a deficient number, since it is larger than the sum of its proper divisors (1).

138870541 is an equidigital number, since it uses as much as digits as its factorization.

138870541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 138870541 is about 11784.3345590661. The cubic root of 138870541 is about 517.8492788587.

The spelling of 138870541 in words is "one hundred thirty-eight million, eight hundred seventy thousand, five hundred forty-one".