138509472941 has 4 divisors (see below), whose sum is σ = 158296540512. Its totient is φ = 118722405372.

The previous prime is 138509472923. The next prime is 138509472949. The reversal of 138509472941 is 149274905831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138509472941 - 2⁶ = 138509472877 is a prime.

It is a super-2 number, since 2×138509472941² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138509472949) 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, 9893533775 + ... + 9893533788.

It is an arithmetic number, because the mean of its divisors is an integer number (39574135128).

Almost surely, 2^138509472941 is an apocalyptic number.

It is an amenable number.

138509472941 is a deficient number, since it is larger than the sum of its proper divisors (19787067571).

138509472941 is an equidigital number, since it uses as much as digits as its factorization.

138509472941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19787067570.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 138509472941 in words is "one hundred thirty-eight billion, five hundred nine million, four hundred seventy-two thousand, nine hundred forty-one".