1090778729 has 2 divisors, whose sum is σ = 1090778730. Its totient is φ = 1090778728.

The previous prime is 1090778723. The next prime is 1090778753. The reversal of 1090778729 is 9278770901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090320400 + 458329 = 33020^2 + 677^2 .

It is a cyclic number.

It is not a de Polignac number, because 1090778729 - 2⁴ = 1090778713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1090778723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545389364 + 545389365.

It is an arithmetic number, because the mean of its divisors is an integer number (545389365).

Almost surely, 2^1090778729 is an apocalyptic number.

It is an amenable number.

1090778729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090778729 is an equidigital number, since it uses as much as digits as its factorization.

1090778729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 50.

The square root of 1090778729 is about 33026.9394434301. The cubic root of 1090778729 is about 1029.3874917415.

The spelling of 1090778729 in words is "one billion, ninety million, seven hundred seventy-eight thousand, seven hundred twenty-nine".