1131199985917 has 2 divisors, whose sum is σ = 1131199985918. Its totient is φ = 1131199985916.

The previous prime is 1131199985879. The next prime is 1131199985939. The reversal of 1131199985917 is 7195899911311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126699454521 + 4500531396 = 1061461^2 + 67086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131199985917 is a prime.

It is a super-2 number, since 2×1131199985917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131199985117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565599992958 + 565599992959.

It is an arithmetic number, because the mean of its divisors is an integer number (565599992959).

Almost surely, 2^{1131199985917} is an apocalyptic number.

It is an amenable number.

1131199985917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131199985917 is an equidigital number, since it uses as much as digits as its factorization.

1131199985917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 64.

The spelling of 1131199985917 in words is "one trillion, one hundred thirty-one billion, one hundred ninety-nine million, nine hundred eighty-five thousand, nine hundred seventeen".