138052961 has 4 divisors (see below), whose sum is σ = 139419924. Its totient is φ = 136686000.

The previous prime is 138052949. The next prime is 138053009. The reversal of 138052961 is 169250831.

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 62710561 + 75342400 = 7919^2 + 8680^2 .

It is a cyclic number.

It is not a de Polignac number, because 138052961 - 2¹⁸ = 137790817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138052931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683330 + ... + 683531.

It is an arithmetic number, because the mean of its divisors is an integer number (34854981).

Almost surely, 2^138052961 is an apocalyptic number.

It is an amenable number.

138052961 is a deficient number, since it is larger than the sum of its proper divisors (1366963).

138052961 is a wasteful number, since it uses less digits than its factorization.

138052961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366962.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 138052961 is about 11749.5940780948. The cubic root of 138052961 is about 516.8310239969.

The spelling of 138052961 in words is "one hundred thirty-eight million, fifty-two thousand, nine hundred sixty-one".