65139617 has 2 divisors, whose sum is σ = 65139618. Its totient is φ = 65139616.

The previous prime is 65139593. The next prime is 65139629. The reversal of 65139617 is 71693156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35153041 + 29986576 = 5929^2 + 5476^2 .

It is a cyclic number.

It is not a de Polignac number, because 65139617 - 2¹⁸ = 64877473 is a prime.

It is not a weakly prime, because it can be changed into another prime (65139667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32569808 + 32569809.

It is an arithmetic number, because the mean of its divisors is an integer number (32569809).

Almost surely, 2^65139617 is an apocalyptic number.

It is an amenable number.

65139617 is a deficient number, since it is larger than the sum of its proper divisors (1).

65139617 is an equidigital number, since it uses as much as digits as its factorization.

65139617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 38.

The square root of 65139617 is about 8070.9117824444. The cubic root of 65139617 is about 402.3602477670.

It can be divided in two parts, 65139 and 617, that added together give a palindrome (65756).

The spelling of 65139617 in words is "sixty-five million, one hundred thirty-nine thousand, six hundred seventeen".