11847889997 has 2 divisors, whose sum is σ = 11847889998. Its totient is φ = 11847889996.

The previous prime is 11847889987. The next prime is 11847890009. The reversal of 11847889997 is 79998874811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11843098276 + 4791721 = 108826^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 11847889997 - 2⁴ = 11847889981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11847889997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11847889967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5923944998 + 5923944999.

It is an arithmetic number, because the mean of its divisors is an integer number (5923944999).

Almost surely, 2^11847889997 is an apocalyptic number.

It is an amenable number.

11847889997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11847889997 is an equidigital number, since it uses as much as digits as its factorization.

11847889997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 71.

The spelling of 11847889997 in words is "eleven billion, eight hundred forty-seven million, eight hundred eighty-nine thousand, nine hundred ninety-seven".