138481487 has 2 divisors, whose sum is σ = 138481488. Its totient is φ = 138481486.

The previous prime is 138481451. The next prime is 138481501. The reversal of 138481487 is 784184831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138481487 - 2⁶ = 138481423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138481087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240743 + 69240744.

It is an arithmetic number, because the mean of its divisors is an integer number (69240744).

Almost surely, 2^138481487 is an apocalyptic number.

138481487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138481487 is an equidigital number, since it uses as much as digits as its factorization.

138481487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 44.

The square root of 138481487 is about 11767.8157276531. The cubic root of 138481487 is about 517.3652314625.

The spelling of 138481487 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, four hundred eighty-seven".