138943061 has 4 divisors (see below), whose sum is σ = 139260000. Its totient is φ = 138626124.

The previous prime is 138943043. The next prime is 138943087. The reversal of 138943061 is 160349831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 160349831 = 17 ⋅9432343.

It is a cyclic number.

It is not a de Polignac number, because 138943061 - 2⁶ = 138942997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138943001) 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, 157811 + ... + 158688.

It is an arithmetic number, because the mean of its divisors is an integer number (34815000).

Almost surely, 2^138943061 is an apocalyptic number.

It is an amenable number.

138943061 is a deficient number, since it is larger than the sum of its proper divisors (316939).

138943061 is an equidigital number, since it uses as much as digits as its factorization.

138943061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316938.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 138943061 is about 11787.4111237371. The cubic root of 138943061 is about 517.9394057116.

The spelling of 138943061 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, sixty-one".