11997517489 has 2 divisors, whose sum is σ = 11997517490. Its totient is φ = 11997517488.

The previous prime is 11997517447. The next prime is 11997517517. The reversal of 11997517489 is 98471579911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11431886400 + 565631089 = 106920^2 + 23783^2 .

It is a cyclic number.

It is not a de Polignac number, because 11997517489 - 2¹⁹ = 11996993201 is a prime.

It is a super-3 number, since 3×11997517489³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (11997517289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5998758744 + 5998758745.

It is an arithmetic number, because the mean of its divisors is an integer number (5998758745).

Almost surely, 2^11997517489 is an apocalyptic number.

It is an amenable number.

11997517489 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997517489 is an equidigital number, since it uses as much as digits as its factorization.

11997517489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 61.

The spelling of 11997517489 in words is "eleven billion, nine hundred ninety-seven million, five hundred seventeen thousand, four hundred eighty-nine".