1010191091 has 32 divisors (see below), whose sum is σ = 1274972160. Its totient is φ = 779186304.

The previous prime is 1010191081. The next prime is 1010191109. The reversal of 1010191091 is 1901910101.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1010191091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1010191081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 595841 + ... + 597533.

It is an arithmetic number, because the mean of its divisors is an integer number (39842880).

Almost surely, 2^1010191091 is an apocalyptic number.

1010191091 is a deficient number, since it is larger than the sum of its proper divisors (264781069).

1010191091 is a wasteful number, since it uses less digits than its factorization.

1010191091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875.

The product of its (nonzero) digits is 81, while the sum is 23.

The square root of 1010191091 is about 31783.5034412508. The cubic root of 1010191091 is about 1003.3855554128.

The spelling of 1010191091 in words is "one billion, ten million, one hundred ninety-one thousand, ninety-one".