1009794991 has 2 divisors, whose sum is σ = 1009794992. Its totient is φ = 1009794990.

The previous prime is 1009794949. The next prime is 1009795001. The reversal of 1009794991 is 1994979001.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1009794991 - 2⁹ = 1009794479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009794901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504897495 + 504897496.

It is an arithmetic number, because the mean of its divisors is an integer number (504897496).

Almost surely, 2^1009794991 is an apocalyptic number.

1009794991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009794991 is an equidigital number, since it uses as much as digits as its factorization.

1009794991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 1009794991 is about 31777.2716103822. The cubic root of 1009794991 is about 1003.2543944277.

The spelling of 1009794991 in words is "one billion, nine million, seven hundred ninety-four thousand, nine hundred ninety-one".