138313939461 has 4 divisors (see below), whose sum is σ = 184418585952. Its totient is φ = 92209292972.

The previous prime is 138313939459. The next prime is 138313939483. The reversal of 138313939461 is 164939313831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 164939313831 = 3 ⋅54979771277.

It is a cyclic number.

It is not a de Polignac number, because 138313939461 - 2¹ = 138313939459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138313939661) 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, 23052323241 + ... + 23052323246.

It is an arithmetic number, because the mean of its divisors is an integer number (46104646488).

Almost surely, 2^138313939461 is an apocalyptic number.

It is an amenable number.

138313939461 is a deficient number, since it is larger than the sum of its proper divisors (46104646491).

138313939461 is an equidigital number, since it uses as much as digits as its factorization.

138313939461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46104646490.

The product of its digits is 1259712, while the sum is 51.

The spelling of 138313939461 in words is "one hundred thirty-eight billion, three hundred thirteen million, nine hundred thirty-nine thousand, four hundred sixty-one".