11787893989 has 2 divisors, whose sum is σ = 11787893990. Its totient is φ = 11787893988.

The previous prime is 11787893963. The next prime is 11787894011. The reversal of 11787893989 is 98939878711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7648901764 + 4138992225 = 87458^2 + 64335^2 .

It is a cyclic number.

It is not a de Polignac number, because 11787893989 - 2⁷ = 11787893861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11787899989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5893946994 + 5893946995.

It is an arithmetic number, because the mean of its divisors is an integer number (5893946995).

Almost surely, 2^11787893989 is an apocalyptic number.

It is an amenable number.

11787893989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11787893989 is an equidigital number, since it uses as much as digits as its factorization.

11787893989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54867456, while the sum is 70.

The spelling of 11787893989 in words is "eleven billion, seven hundred eighty-seven million, eight hundred ninety-three thousand, nine hundred eighty-nine".