138171801 has 24 divisors (see below), whose sum is σ = 200581920. Its totient is φ = 84310272.

The previous prime is 138171799. The next prime is 138171821. The reversal of 138171801 is 108171831.

It is a happy number.

It is not a de Polignac number, because 138171801 - 2¹ = 138171799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138171821) 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 23 ways as a sum of consecutive naturals, for example, 68830 + ... + 70808.

It is an arithmetic number, because the mean of its divisors is an integer number (8357580).

Almost surely, 2^138171801 is an apocalyptic number.

It is an amenable number.

138171801 is a deficient number, since it is larger than the sum of its proper divisors (62410119).

138171801 is a wasteful number, since it uses less digits than its factorization.

138171801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 30.

The square root of 138171801 is about 11754.6501862029. The cubic root of 138171801 is about 516.9792825173.

Adding to 138171801 its sum of digits (30), we get a palindrome (138171831).

The spelling of 138171801 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, eight hundred one".