1011200989 has 2 divisors, whose sum is σ = 1011200990. Its totient is φ = 1011200988.

The previous prime is 1011200963. The next prime is 1011201011. The reversal of 1011200989 is 9890021101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530933764 + 480267225 = 23042^2 + 21915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011200989 - 2¹³ = 1011192797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011200989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011200909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505600494 + 505600495.

It is an arithmetic number, because the mean of its divisors is an integer number (505600495).

Almost surely, 2^1011200989 is an apocalyptic number.

It is an amenable number.

1011200989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011200989 is an equidigital number, since it uses as much as digits as its factorization.

1011200989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 1011200989 is about 31799.3866135811. The cubic root of 1011200989 is about 1003.7198088650.

The spelling of 1011200989 in words is "one billion, eleven million, two hundred thousand, nine hundred eighty-nine".