138201786231 has 4 divisors (see below), whose sum is σ = 184269048312. Its totient is φ = 92134524152.

The previous prime is 138201786187. The next prime is 138201786257. The reversal of 138201786231 is 132687102831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138201786231 - 2⁷ = 138201786103 is a prime.

It is a super-2 number, since 2×138201786231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138201786631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23033631036 + ... + 23033631041.

It is an arithmetic number, because the mean of its divisors is an integer number (46067262078).

Almost surely, 2^138201786231 is an apocalyptic number.

138201786231 is a deficient number, since it is larger than the sum of its proper divisors (46067262081).

138201786231 is an equidigital number, since it uses as much as digits as its factorization.

138201786231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46067262080.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 138201786231 in words is "one hundred thirty-eight billion, two hundred one million, seven hundred eighty-six thousand, two hundred thirty-one".