138953777 has 2 divisors, whose sum is σ = 138953778. Its totient is φ = 138953776.

The previous prime is 138953747. The next prime is 138953807. The reversal of 138953777 is 777359831.

It is a balanced prime because it is at equal distance from previous prime (138953747) and next prime (138953807).

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 57214096 = 9041^2 + 7564^2 .

It is an emirp because it is prime and its reverse (777359831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138953777 - 2¹⁰ = 138952753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138953747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69476888 + 69476889.

It is an arithmetic number, because the mean of its divisors is an integer number (69476889).

Almost surely, 2^138953777 is an apocalyptic number.

It is an amenable number.

138953777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138953777 is an equidigital number, since it uses as much as digits as its factorization.

138953777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 50.

The square root of 138953777 is about 11787.8656677110. The cubic root of 138953777 is about 517.9527207486.

The spelling of 138953777 in words is "one hundred thirty-eight million, nine hundred fifty-three thousand, seven hundred seventy-seven".