1009191971 has 2 divisors, whose sum is σ = 1009191972. Its totient is φ = 1009191970.

The previous prime is 1009191959. The next prime is 1009192013. The reversal of 1009191971 is 1791919001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009191971 is a prime.

It is not a weakly prime, because it can be changed into another prime (1009191901) 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, 504595985 + 504595986.

It is an arithmetic number, because the mean of its divisors is an integer number (504595986).

Almost surely, 2^1009191971 is an apocalyptic number.

1009191971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009191971 is an equidigital number, since it uses as much as digits as its factorization.

1009191971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103, while the sum is 38.

The square root of 1009191971 is about 31767.7819653812. The cubic root of 1009191971 is about 1003.0546499462.

The spelling of 1009191971 in words is "one billion, nine million, one hundred ninety-one thousand, nine hundred seventy-one".