139608971 has 2 divisors, whose sum is σ = 139608972. Its totient is φ = 139608970.

The previous prime is 139608907. The next prime is 139608983. The reversal of 139608971 is 179806931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139608971 - 2⁶ = 139608907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (139608991) 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, 69804485 + 69804486.

It is an arithmetic number, because the mean of its divisors is an integer number (69804486).

Almost surely, 2^139608971 is an apocalyptic number.

139608971 is a deficient number, since it is larger than the sum of its proper divisors (1).

139608971 is an equidigital number, since it uses as much as digits as its factorization.

139608971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 139608971 is about 11815.6240207617. The cubic root of 139608971 is about 518.7655270719.

The spelling of 139608971 in words is "one hundred thirty-nine million, six hundred eight thousand, nine hundred seventy-one".