138871361 has 4 divisors (see below), whose sum is σ = 146180400. Its totient is φ = 131562324.

The previous prime is 138871357. The next prime is 138871363. The reversal of 138871361 is 163178831.

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: 163178831 = 10141 ⋅16091.

It is a cyclic number.

It is not a de Polignac number, because 138871361 - 2² = 138871357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138871363) 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, 3654491 + ... + 3654528.

It is an arithmetic number, because the mean of its divisors is an integer number (36545100).

Almost surely, 2^138871361 is an apocalyptic number.

It is an amenable number.

138871361 is a deficient number, since it is larger than the sum of its proper divisors (7309039).

138871361 is an equidigital number, since it uses as much as digits as its factorization.

138871361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309038.

The product of its digits is 24192, while the sum is 38.

The square root of 138871361 is about 11784.3693509666. The cubic root of 138871361 is about 517.8502981187.

The spelling of 138871361 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, three hundred sixty-one".