1091263909 has 2 divisors, whose sum is σ = 1091263910. Its totient is φ = 1091263908.

The previous prime is 1091263897. The next prime is 1091263961. The reversal of 1091263909 is 9093621901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550840900 + 540423009 = 23470^2 + 23247^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091263909 - 2¹⁹ = 1090739621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091263969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545631954 + 545631955.

It is an arithmetic number, because the mean of its divisors is an integer number (545631955).

Almost surely, 2^1091263909 is an apocalyptic number.

It is an amenable number.

1091263909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091263909 is an equidigital number, since it uses as much as digits as its factorization.

1091263909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 1091263909 is about 33034.2838426989. The cubic root of 1091263909 is about 1029.5400934801.

The spelling of 1091263909 in words is "one billion, ninety-one million, two hundred sixty-three thousand, nine hundred nine".