138534973 has 2 divisors, whose sum is σ = 138534974. Its totient is φ = 138534972.

The previous prime is 138534937. The next prime is 138534983. The reversal of 138534973 is 379435831.

It is a happy number.

Together with previous prime (138534937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107599129 + 30935844 = 10373^2 + 5562^2 .

It is an emirp because it is prime and its reverse (379435831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138534973 - 2¹⁷ = 138403901 is a prime.

It is a super-2 number, since 2×138534973² = 38383877488221458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138534983) 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, 69267486 + 69267487.

It is an arithmetic number, because the mean of its divisors is an integer number (69267487).

Almost surely, 2^138534973 is an apocalyptic number.

It is an amenable number.

138534973 is a deficient number, since it is larger than the sum of its proper divisors (1).

138534973 is an equidigital number, since it uses as much as digits as its factorization.

138534973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 138534973 is about 11770.0880625423. The cubic root of 138534973 is about 517.4318305812.

The spelling of 138534973 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, nine hundred seventy-three".