1121012989 has 2 divisors, whose sum is σ = 1121012990. Its totient is φ = 1121012988.

The previous prime is 1121012983. The next prime is 1121013037. The reversal of 1121012989 is 9892101211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676520100 + 444492889 = 26010^2 + 21083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121012989 - 2²⁵ = 1087458557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121012983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560506494 + 560506495.

It is an arithmetic number, because the mean of its divisors is an integer number (560506495).

Almost surely, 2^1121012989 is an apocalyptic number.

It is an amenable number.

1121012989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121012989 is an equidigital number, since it uses as much as digits as its factorization.

1121012989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 1121012989 is about 33481.5320587335. The cubic root of 1121012989 is about 1038.8118176567.

It can be divided in two parts, 112 and 1012989, that added together give a palindrome (1013101).

The spelling of 1121012989 in words is "one billion, one hundred twenty-one million, twelve thousand, nine hundred eighty-nine".