138481753 has 2 divisors, whose sum is σ = 138481754. Its totient is φ = 138481752.

The previous prime is 138481727. The next prime is 138481771. The reversal of 138481753 is 357184831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98942809 + 39538944 = 9947^2 + 6288^2 .

It is an emirp because it is prime and its reverse (357184831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138481753 - 2²¹ = 136384601 is a prime.

It is not a weakly prime, because it can be changed into another prime (138481793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240876 + 69240877.

It is an arithmetic number, because the mean of its divisors is an integer number (69240877).

Almost surely, 2^138481753 is an apocalyptic number.

It is an amenable number.

138481753 is a deficient number, since it is larger than the sum of its proper divisors (1).

138481753 is an equidigital number, since it uses as much as digits as its factorization.

138481753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 138481753 is about 11767.8270296601. The cubic root of 138481753 is about 517.3655627199.

The spelling of 138481753 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred fifty-three".