138577969 has 2 divisors, whose sum is σ = 138577970. Its totient is φ = 138577968.

The previous prime is 138577937. The next prime is 138577997. The reversal of 138577969 is 969775831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133102369 + 5475600 = 11537^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 138577969 - 2⁵ = 138577937 is a prime.

It is a super-3 number, since 3×138577969³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (138572969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69288984 + 69288985.

It is an arithmetic number, because the mean of its divisors is an integer number (69288985).

Almost surely, 2^138577969 is an apocalyptic number.

It is an amenable number.

138577969 is a deficient number, since it is larger than the sum of its proper divisors (1).

138577969 is an equidigital number, since it uses as much as digits as its factorization.

138577969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 55.

The square root of 138577969 is about 11771.9144152512. The cubic root of 138577969 is about 517.4853554476.

The spelling of 138577969 in words is "one hundred thirty-eight million, five hundred seventy-seven thousand, nine hundred sixty-nine".