139171577761 has 4 divisors (see below), whose sum is σ = 139175809024. Its totient is φ = 139167346500.

The previous prime is 139171577719. The next prime is 139171577791. The reversal of 139171577761 is 167775171931.

139171577761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 167775171931 = 11443 ⋅14661817.

It is a cyclic number.

It is not a de Polignac number, because 139171577761 - 2¹⁹ = 139171053473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139171577791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065905 + ... + 2132206.

It is an arithmetic number, because the mean of its divisors is an integer number (34793952256).

Almost surely, 2^139171577761 is an apocalyptic number.

It is an amenable number.

139171577761 is a deficient number, since it is larger than the sum of its proper divisors (4231263).

139171577761 is an equidigital number, since it uses as much as digits as its factorization.

139171577761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231262.

The product of its digits is 1944810, while the sum is 55.

The spelling of 139171577761 in words is "one hundred thirty-nine billion, one hundred seventy-one million, five hundred seventy-seven thousand, seven hundred sixty-one".