138682541 has 4 divisors (see below), whose sum is σ = 142065084. Its totient is φ = 135300000.

The previous prime is 138682517. The next prime is 138682567. The reversal of 138682541 is 145286831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145286831 = 139 ⋅1045229.

It can be written as a sum of positive squares in 2 ways, for example, as 3076516 + 135606025 = 1754^2 + 11645^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138682541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138682495 and 138682504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138682741) 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, 1691210 + ... + 1691291.

It is an arithmetic number, because the mean of its divisors is an integer number (35516271).

Almost surely, 2^138682541 is an apocalyptic number.

It is an amenable number.

138682541 is a deficient number, since it is larger than the sum of its proper divisors (3382543).

138682541 is an equidigital number, since it uses as much as digits as its factorization.

138682541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382542.

The product of its digits is 46080, while the sum is 38.

The square root of 138682541 is about 11776.3551661794. The cubic root of 138682541 is about 517.6154888615.

The spelling of 138682541 in words is "one hundred thirty-eight million, six hundred eighty-two thousand, five hundred forty-one".