138351181 has 4 divisors (see below), whose sum is σ = 140416192. Its totient is φ = 136286172.

The previous prime is 138351173. The next prime is 138351259. The reversal of 138351181 is 181153831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138351181 - 2³ = 138351173 is a prime.

It is a super-2 number, since 2×138351181² = 38282098568189522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138351121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032405 + ... + 1032538.

It is an arithmetic number, because the mean of its divisors is an integer number (35104048).

Almost surely, 2^138351181 is an apocalyptic number.

It is an amenable number.

138351181 is a deficient number, since it is larger than the sum of its proper divisors (2065011).

138351181 is an equidigital number, since it uses as much as digits as its factorization.

138351181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065010.

The product of its digits is 2880, while the sum is 31.

The square root of 138351181 is about 11762.2778831313. The cubic root of 138351181 is about 517.2029066357.

The spelling of 138351181 in words is "one hundred thirty-eight million, three hundred fifty-one thousand, one hundred eighty-one".