11916631589 has 2 divisors, whose sum is σ = 11916631590. Its totient is φ = 11916631588.

The previous prime is 11916631583. The next prime is 11916631633. The reversal of 11916631589 is 98513661911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8328022564 + 3588609025 = 91258^2 + 59905^2 .

It is a cyclic number.

It is not a de Polignac number, because 11916631589 - 2⁸ = 11916631333 is a prime.

It is a super-2 number, since 2×11916631589² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11916631583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5958315794 + 5958315795.

It is an arithmetic number, because the mean of its divisors is an integer number (5958315795).

Almost surely, 2^11916631589 is an apocalyptic number.

It is an amenable number.

11916631589 is a deficient number, since it is larger than the sum of its proper divisors (1).

11916631589 is an equidigital number, since it uses as much as digits as its factorization.

11916631589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The spelling of 11916631589 in words is "eleven billion, nine hundred sixteen million, six hundred thirty-one thousand, five hundred eighty-nine".