1009921291 has 2 divisors, whose sum is σ = 1009921292. Its totient is φ = 1009921290.

The previous prime is 1009921277. The next prime is 1009921303. The reversal of 1009921291 is 1921299001.

It is a strong prime.

It is an emirp because it is prime and its reverse (1921299001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1009921291 - 2¹¹ = 1009919243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1009921391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504960645 + 504960646.

It is an arithmetic number, because the mean of its divisors is an integer number (504960646).

Almost surely, 2^1009921291 is an apocalyptic number.

1009921291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009921291 is an equidigital number, since it uses as much as digits as its factorization.

1009921291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 1009921291 is about 31779.2588176628. The cubic root of 1009921291 is about 1003.2962199959.

The spelling of 1009921291 in words is "one billion, nine million, nine hundred twenty-one thousand, two hundred ninety-one".