1096721609 has 2 divisors, whose sum is σ = 1096721610. Its totient is φ = 1096721608.

The previous prime is 1096721603. The next prime is 1096721611. The reversal of 1096721609 is 9061276901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776848384 + 319873225 = 27872^2 + 17885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1096721609 is a prime.

Together with 1096721611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1096721603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548360804 + 548360805.

It is an arithmetic number, because the mean of its divisors is an integer number (548360805).

Almost surely, 2^1096721609 is an apocalyptic number.

It is an amenable number.

1096721609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1096721609 is an equidigital number, since it uses as much as digits as its factorization.

1096721609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1096721609 is about 33116.7874196758. The cubic root of 1096721609 is about 1031.2535744033.

The spelling of 1096721609 in words is "one billion, ninety-six million, seven hundred twenty-one thousand, six hundred nine".