138787633 has 2 divisors, whose sum is σ = 138787634. Its totient is φ = 138787632.

The previous prime is 138787613. The next prime is 138787637. The reversal of 138787633 is 336787831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103063104 + 35724529 = 10152^2 + 5977^2 .

It is an emirp because it is prime and its reverse (336787831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138787633 - 2¹³ = 138779441 is a prime.

It is not a weakly prime, because it can be changed into another prime (138787637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69393816 + 69393817.

It is an arithmetic number, because the mean of its divisors is an integer number (69393817).

Almost surely, 2^138787633 is an apocalyptic number.

It is an amenable number.

138787633 is a deficient number, since it is larger than the sum of its proper divisors (1).

138787633 is an equidigital number, since it uses as much as digits as its factorization.

138787633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 138787633 is about 11780.8163129725. The cubic root of 138787633 is about 517.7462034941.

The spelling of 138787633 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, six hundred thirty-three".