1181989001 has 2 divisors, whose sum is σ = 1181989002. Its totient is φ = 1181989000.

The previous prime is 1181988979. The next prime is 1181989007. The reversal of 1181989001 is 1009891811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 735765625 + 446223376 = 27125^2 + 21124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181989001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181989007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590994500 + 590994501.

It is an arithmetic number, because the mean of its divisors is an integer number (590994501).

Almost surely, 2^1181989001 is an apocalyptic number.

It is an amenable number.

1181989001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181989001 is an equidigital number, since it uses as much as digits as its factorization.

1181989001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 38.

The square root of 1181989001 is about 34380.0669138383. The cubic root of 1181989001 is about 1057.3152066410.

The spelling of 1181989001 in words is "one billion, one hundred eighty-one million, nine hundred eighty-nine thousand, one".