1239106657 has 2 divisors, whose sum is σ = 1239106658. Its totient is φ = 1239106656.

The previous prime is 1239106651. The next prime is 1239106667. The reversal of 1239106657 is 7566019321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894967056 + 344139601 = 29916^2 + 18551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239106657 - 2¹¹ = 1239104609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1239106651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619553328 + 619553329.

It is an arithmetic number, because the mean of its divisors is an integer number (619553329).

Almost surely, 2^1239106657 is an apocalyptic number.

It is an amenable number.

1239106657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239106657 is an equidigital number, since it uses as much as digits as its factorization.

1239106657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1239106657 is about 35200.9468196525. The cubic root of 1239106657 is about 1074.0790112915.

The spelling of 1239106657 in words is "one billion, two hundred thirty-nine million, one hundred six thousand, six hundred fifty-seven".