1081289197 has 2 divisors, whose sum is σ = 1081289198. Its totient is φ = 1081289196.

The previous prime is 1081289173. The next prime is 1081289227. The reversal of 1081289197 is 7919821801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073610756 + 7678441 = 32766^2 + 2771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1081289197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1081289117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540644598 + 540644599.

It is an arithmetic number, because the mean of its divisors is an integer number (540644599).

Almost surely, 2^1081289197 is an apocalyptic number.

It is an amenable number.

1081289197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1081289197 is an equidigital number, since it uses as much as digits as its factorization.

1081289197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 1081289197 is about 32882.9621080583. The cubic root of 1081289197 is about 1026.3936456490.

The spelling of 1081289197 in words is "one billion, eighty-one million, two hundred eighty-nine thousand, one hundred ninety-seven".