138897541 has 2 divisors, whose sum is σ = 138897542. Its totient is φ = 138897540.

The previous prime is 138897533. The next prime is 138897547. The reversal of 138897541 is 145798831.

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., 97101316 + 41796225 = 9854^2 + 6465^2 .

It is a cyclic number.

It is not a de Polignac number, because 138897541 - 2³ = 138897533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138897491 and 138897500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138897547) 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, 69448770 + 69448771.

It is an arithmetic number, because the mean of its divisors is an integer number (69448771).

Almost surely, 2^138897541 is an apocalyptic number.

It is an amenable number.

138897541 is a deficient number, since it is larger than the sum of its proper divisors (1).

138897541 is an equidigital number, since it uses as much as digits as its factorization.

138897541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 138897541 is about 11785.4800920455. The cubic root of 138897541 is about 517.8828377507.

The spelling of 138897541 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, five hundred forty-one".