1081196989 has 2 divisors, whose sum is σ = 1081196990. Its totient is φ = 1081196988.

The previous prime is 1081196981. The next prime is 1081197079. The reversal of 1081196989 is 9896911801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746928900 + 334268089 = 27330^2 + 18283^2 .

It is a cyclic number.

It is not a de Polignac number, because 1081196989 - 2³ = 1081196981 is a prime.

It is a super-2 number, since 2×1081196989² = 2337973858045332242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081196981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540598494 + 540598495.

It is an arithmetic number, because the mean of its divisors is an integer number (540598495).

Almost surely, 2^1081196989 is an apocalyptic number.

It is an amenable number.

1081196989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081196989 is an equidigital number, since it uses as much as digits as its factorization.

1081196989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 52.

The square root of 1081196989 is about 32881.5600146952. The cubic root of 1081196989 is about 1026.3644692437.

The spelling of 1081196989 in words is "one billion, eighty-one million, one hundred ninety-six thousand, nine hundred eighty-nine".