139631617 has 2 divisors, whose sum is σ = 139631618. Its totient is φ = 139631616.

The previous prime is 139631603. The next prime is 139631629. The reversal of 139631617 is 716136931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 10491121 = 11364^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 139631617 - 2¹¹ = 139629569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139631017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69815808 + 69815809.

It is an arithmetic number, because the mean of its divisors is an integer number (69815809).

Almost surely, 2^139631617 is an apocalyptic number.

It is an amenable number.

139631617 is a deficient number, since it is larger than the sum of its proper divisors (1).

139631617 is an equidigital number, since it uses as much as digits as its factorization.

139631617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 37.

The square root of 139631617 is about 11816.5822893085. The cubic root of 139631617 is about 518.7935752431.

The spelling of 139631617 in words is "one hundred thirty-nine million, six hundred thirty-one thousand, six hundred seventeen".