138931201 has 8 divisors (see below), whose sum is σ = 148057344. Its totient is φ = 130062240.

The previous prime is 138931193. The next prime is 138931207. The reversal of 138931201 is 102139831.

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

It is not a de Polignac number, because 138931201 - 2³ = 138931193 is a prime.

It is a super-2 number, since 2×138931201² = 38603757222604802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138931201.

It is not an unprimeable number, because it can be changed into a prime (138931207) 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, 63180 + ... + 65341.

It is an arithmetic number, because the mean of its divisors is an integer number (18507168).

Almost surely, 2^138931201 is an apocalyptic number.

It is an amenable number.

138931201 is a deficient number, since it is larger than the sum of its proper divisors (9126143).

138931201 is a wasteful number, since it uses less digits than its factorization.

138931201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128591.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 138931201 is about 11786.9080339163. The cubic root of 138931201 is about 517.9246684130.

The spelling of 138931201 in words is "one hundred thirty-eight million, nine hundred thirty-one thousand, two hundred one".