138154913 has 8 divisors (see below), whose sum is σ = 148881768. Its totient is φ = 127442304.

The previous prime is 138154901. The next prime is 138154957. The reversal of 138154913 is 319451831.

It can be written as a sum of positive squares in 4 ways, for example, as 21904 + 138133009 = 148^2 + 11753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138154913 - 2⁴ = 138154897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138154213) 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 7 ways as a sum of consecutive naturals, for example, 25295 + ... + 30267.

It is an arithmetic number, because the mean of its divisors is an integer number (18610221).

Almost surely, 2^138154913 is an apocalyptic number.

138154913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138154913 is a deficient number, since it is larger than the sum of its proper divisors (10726855).

138154913 is a wasteful number, since it uses less digits than its factorization.

138154913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123.

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

The square root of 138154913 is about 11753.9318102497. The cubic root of 138154913 is about 516.9582191219.

The spelling of 138154913 in words is "one hundred thirty-eight million, one hundred fifty-four thousand, nine hundred thirteen".