1355961617 has 2 divisors, whose sum is σ = 1355961618. Its totient is φ = 1355961616.

The previous prime is 1355961589. The next prime is 1355961631. The reversal of 1355961617 is 7161695531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1353577681 + 2383936 = 36791^2 + 1544^2 .

It is an emirp because it is prime and its reverse (7161695531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355961617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1355961647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677980808 + 677980809.

It is an arithmetic number, because the mean of its divisors is an integer number (677980809).

Almost surely, 2^1355961617 is an apocalyptic number.

It is an amenable number.

1355961617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355961617 is an equidigital number, since it uses as much as digits as its factorization.

1355961617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 1355961617 is about 36823.3841057554. The cubic root of 1355961617 is about 1106.8339336352.

The spelling of 1355961617 in words is "one billion, three hundred fifty-five million, nine hundred sixty-one thousand, six hundred seventeen".