139171983 has 4 divisors (see below), whose sum is σ = 185562648. Its totient is φ = 92781320.

The previous prime is 139171969. The next prime is 139171987. The reversal of 139171983 is 389171931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389171931 = 3 ⋅129723977.

It is a cyclic number.

It is not a de Polignac number, because 139171983 - 2⁸ = 139171727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139171987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23195328 + ... + 23195333.

It is an arithmetic number, because the mean of its divisors is an integer number (46390662).

Almost surely, 2^139171983 is an apocalyptic number.

139171983 is a deficient number, since it is larger than the sum of its proper divisors (46390665).

139171983 is an equidigital number, since it uses as much as digits as its factorization.

139171983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46390664.

The product of its digits is 40824, while the sum is 42.

The square root of 139171983 is about 11797.1175716783. The cubic root of 139171983 is about 518.2237012258.

The spelling of 139171983 in words is "one hundred thirty-nine million, one hundred seventy-one thousand, nine hundred eighty-three".