138572251 has 8 divisors (see below), whose sum is σ = 142581600. Its totient is φ = 134592960.

The previous prime is 138572243. The next prime is 138572293. The reversal of 138572251 is 152275831.

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 138572251 - 2³ = 138572243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138572221) 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 7 ways as a sum of consecutive naturals, for example, 2010 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (17822700).

Almost surely, 2^138572251 is an apocalyptic number.

138572251 is a deficient number, since it is larger than the sum of its proper divisors (4009349).

138572251 is a wasteful number, since it uses less digits than its factorization.

138572251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15029.

The product of its digits is 16800, while the sum is 34.

The square root of 138572251 is about 11771.6715465562. The cubic root of 138572251 is about 517.4782378613.

The spelling of 138572251 in words is "one hundred thirty-eight million, five hundred seventy-two thousand, two hundred fifty-one".