1081728197 has 12 divisors (see below), whose sum is σ = 1245449376. Its totient is φ = 931628520.

The previous prime is 1081728187. The next prime is 1081728209. The reversal of 1081728197 is 7918271801.

It is not a de Polignac number, because 1081728197 - 2¹⁸ = 1081466053 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081728107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132233 + ... + 140174.

It is an arithmetic number, because the mean of its divisors is an integer number (103787448).

Almost surely, 2^1081728197 is an apocalyptic number.

It is an amenable number.

1081728197 is a deficient number, since it is larger than the sum of its proper divisors (163721179).

1081728197 is a wasteful number, since it uses less digits than its factorization.

1081728197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272456 (or 272437 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 44.

The square root of 1081728197 is about 32889.6366200662. The cubic root of 1081728197 is about 1026.5325310482.

Adding to 1081728197 its reverse (7918271801), we get a palindrome (8999999998).

The spelling of 1081728197 in words is "one billion, eighty-one million, seven hundred twenty-eight thousand, one hundred ninety-seven".