138856251 has 8 divisors (see below), whose sum is σ = 185548624. Its totient is φ = 92367360.

The previous prime is 138856241. The next prime is 138856259. The reversal of 138856251 is 152658831.

138856251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 138856251 - 2⁵ = 138856219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138856259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49270 + ... + 52011.

It is an arithmetic number, because the mean of its divisors is an integer number (23193578).

Almost surely, 2^138856251 is an apocalyptic number.

138856251 is a deficient number, since it is larger than the sum of its proper divisors (46692373).

138856251 is a wasteful number, since it uses less digits than its factorization.

138856251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101741.

The product of its digits is 57600, while the sum is 39.

The square root of 138856251 is about 11783.7282300637. The cubic root of 138856251 is about 517.8315157440.

The spelling of 138856251 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, two hundred fifty-one".