138790964969 has 4 divisors (see below), whose sum is σ = 139804037844. Its totient is φ = 137777892096.

The previous prime is 138790964927. The next prime is 138790965017. The reversal of 138790964969 is 969469097831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53358690025 + 85432274944 = 230995^2 + 292288^2 .

It is a cyclic number.

It is not a de Polignac number, because 138790964969 - 2⁸ = 138790964713 is a prime.

It is a super-2 number, since 2×138790964969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138790964269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506536232 + ... + 506536505.

It is an arithmetic number, because the mean of its divisors is an integer number (34951009461).

Almost surely, 2^138790964969 is an apocalyptic number.

It is an amenable number.

138790964969 is a deficient number, since it is larger than the sum of its proper divisors (1013072875).

138790964969 is a wasteful number, since it uses less digits than its factorization.

138790964969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013072874.

The product of its (nonzero) digits is 158723712, while the sum is 71.

The spelling of 138790964969 in words is "one hundred thirty-eight billion, seven hundred ninety million, nine hundred sixty-four thousand, nine hundred sixty-nine".