138551331 has 8 divisors (see below), whose sum is σ = 185008320. Its totient is φ = 92230952.

The previous prime is 138551323. The next prime is 138551339. The reversal of 138551331 is 133155831.

It is an interprime number because it is at equal distance from previous prime (138551323) and next prime (138551339).

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 138551331 - 2³ = 138551323 is a prime.

It is a super-2 number, since 2×138551331² = 38392942643743122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138551339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31761 + ... + 35858.

It is an arithmetic number, because the mean of its divisors is an integer number (23126040).

Almost surely, 2^138551331 is an apocalyptic number.

138551331 is a deficient number, since it is larger than the sum of its proper divisors (46456989).

138551331 is an equidigital number, since it uses as much as digits as its factorization.

138551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68305.

The product of its digits is 5400, while the sum is 30.

The square root of 138551331 is about 11770.7829391252. The cubic root of 138551331 is about 517.4521956355.

The spelling of 138551331 in words is "one hundred thirty-eight million, five hundred fifty-one thousand, three hundred thirty-one".