138491825919 has 4 divisors (see below), whose sum is σ = 184655767896. Its totient is φ = 92327883944.

The previous prime is 138491825917. The next prime is 138491825921. The reversal of 138491825919 is 919528194831.

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

It is an interprime number because it is at equal distance from previous prime (138491825917) and next prime (138491825921).

It is a cyclic number.

It is not a de Polignac number, because 138491825919 - 2¹ = 138491825917 is a prime.

It is a super-2 number, since 2×138491825919² (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 (138491825917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23081970984 + ... + 23081970989.

It is an arithmetic number, because the mean of its divisors is an integer number (46163941974).

Almost surely, 2^138491825919 is an apocalyptic number.

138491825919 is a deficient number, since it is larger than the sum of its proper divisors (46163941977).

138491825919 is an equidigital number, since it uses as much as digits as its factorization.

138491825919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46163941976.

The product of its digits is 5598720, while the sum is 60.

The spelling of 138491825919 in words is "one hundred thirty-eight billion, four hundred ninety-one million, eight hundred twenty-five thousand, nine hundred nineteen".