139879171 has 2 divisors, whose sum is σ = 139879172. Its totient is φ = 139879170.

The previous prime is 139879133. The next prime is 139879177. The reversal of 139879171 is 171978931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139879171 is a prime.

It is not a weakly prime, because it can be changed into another prime (139879177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69939585 + 69939586.

It is an arithmetic number, because the mean of its divisors is an integer number (69939586).

Almost surely, 2^139879171 is an apocalyptic number.

139879171 is a deficient number, since it is larger than the sum of its proper divisors (1).

139879171 is an equidigital number, since it uses as much as digits as its factorization.

139879171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 46.

The square root of 139879171 is about 11827.0525068590. The cubic root of 139879171 is about 519.0999853153.

The spelling of 139879171 in words is "one hundred thirty-nine million, eight hundred seventy-nine thousand, one hundred seventy-one".