1091238949 has 2 divisors, whose sum is σ = 1091238950. Its totient is φ = 1091238948.

The previous prime is 1091238923. The next prime is 1091238961. The reversal of 1091238949 is 9498321901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1090188324 + 1050625 = 33018^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091238949 - 2⁹ = 1091238437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1091238899 and 1091238908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091232949) 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, 545619474 + 545619475.

It is an arithmetic number, because the mean of its divisors is an integer number (545619475).

Almost surely, 2^1091238949 is an apocalyptic number.

It is an amenable number.

1091238949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091238949 is an equidigital number, since it uses as much as digits as its factorization.

1091238949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1091238949 is about 33033.9060512074. The cubic root of 1091238949 is about 1029.5322440141.

The spelling of 1091238949 in words is "one billion, ninety-one million, two hundred thirty-eight thousand, nine hundred forty-nine".