1191537317417 has 2 divisors, whose sum is σ = 1191537317418. Its totient is φ = 1191537317416.

The previous prime is 1191537317413. The next prime is 1191537317437. The reversal of 1191537317417 is 7147137351911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1126122093721 + 65415223696 = 1061189^2 + 255764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191537317417 - 2² = 1191537317413 is a prime.

It is a super-2 number, since 2×1191537317417² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1191537317413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595768658708 + 595768658709.

It is an arithmetic number, because the mean of its divisors is an integer number (595768658709).

Almost surely, 2^{1191537317417} is an apocalyptic number.

It is an amenable number.

1191537317417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191537317417 is an equidigital number, since it uses as much as digits as its factorization.

1191537317417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555660, while the sum is 50.

The spelling of 1191537317417 in words is "one trillion, one hundred ninety-one billion, five hundred thirty-seven million, three hundred seventeen thousand, four hundred seventeen".