1097777209 has 4 divisors (see below), whose sum is σ = 1104122916. Its totient is φ = 1091431504.

The previous prime is 1097777203. The next prime is 1097777243. The reversal of 1097777209 is 9027777901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9027777901 = 22573 ⋅399937.

It can be written as a sum of positive squares in 2 ways, for example, as 957283600 + 140493609 = 30940^2 + 11853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1097777209 - 2⁷ = 1097777081 is a prime.

It is a super-2 number, since 2×1097777209² = 2410229601199659362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097777203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3172594 + ... + 3172939.

It is an arithmetic number, because the mean of its divisors is an integer number (276030729).

Almost surely, 2^1097777209 is an apocalyptic number.

It is an amenable number.

1097777209 is a deficient number, since it is larger than the sum of its proper divisors (6345707).

1097777209 is an equidigital number, since it uses as much as digits as its factorization.

1097777209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345706.

The product of its (nonzero) digits is 388962, while the sum is 49.

The square root of 1097777209 is about 33132.7211227813. The cubic root of 1097777209 is about 1031.5843305383.

The spelling of 1097777209 in words is "one billion, ninety-seven million, seven hundred seventy-seven thousand, two hundred nine".