1091261849 has 2 divisors, whose sum is σ = 1091261850. Its totient is φ = 1091261848.

The previous prime is 1091261837. The next prime is 1091261881. The reversal of 1091261849 is 9481621901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058851600 + 32410249 = 32540^2 + 5693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091261849 - 2²⁰ = 1090213273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091261449) 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 as a sum of consecutive naturals, namely, 545630924 + 545630925.

It is an arithmetic number, because the mean of its divisors is an integer number (545630925).

Almost surely, 2^1091261849 is an apocalyptic number.

It is an amenable number.

1091261849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091261849 is an equidigital number, since it uses as much as digits as its factorization.

1091261849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1091261849 is about 33034.2526629558. The cubic root of 1091261849 is about 1029.5394456521.

The spelling of 1091261849 in words is "one billion, ninety-one million, two hundred sixty-one thousand, eight hundred forty-nine".