1109781397 has 2 divisors, whose sum is σ = 1109781398. Its totient is φ = 1109781396.

The previous prime is 1109781391. The next prime is 1109781433. The reversal of 1109781397 is 7931879011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026497521 + 83283876 = 32039^2 + 9126^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109781397 - 2²⁷ = 975563669 is a prime.

It is a super-2 number, since 2×1109781397² = 2463229498254543218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109781391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554890698 + 554890699.

It is an arithmetic number, because the mean of its divisors is an integer number (554890699).

Almost surely, 2^1109781397 is an apocalyptic number.

It is an amenable number.

1109781397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109781397 is an equidigital number, since it uses as much as digits as its factorization.

1109781397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 46.

The square root of 1109781397 is about 33313.3816506220. The cubic root of 1109781397 is about 1035.3308306300.

The spelling of 1109781397 in words is "one billion, one hundred nine million, seven hundred eighty-one thousand, three hundred ninety-seven".