11851530989 has 2 divisors, whose sum is σ = 11851530990. Its totient is φ = 11851530988.

The previous prime is 11851530959. The next prime is 11851531001. The reversal of 11851530989 is 98903515811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9454645225 + 2396885764 = 97235^2 + 48958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11851530989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11851530959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5925765494 + 5925765495.

It is an arithmetic number, because the mean of its divisors is an integer number (5925765495).

Almost surely, 2^11851530989 is an apocalyptic number.

It is an amenable number.

11851530989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11851530989 is an equidigital number, since it uses as much as digits as its factorization.

11851530989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 50.

The spelling of 11851530989 in words is "eleven billion, eight hundred fifty-one million, five hundred thirty thousand, nine hundred eighty-nine".