1009145919191 has 4 divisors (see below), whose sum is σ = 1009148013384. Its totient is φ = 1009143825000.

The previous prime is 1009145919163. The next prime is 1009145919233. The reversal of 1009145919191 is 1919195419001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1009145919191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009145919791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80441 + ... + 1422941.

It is an arithmetic number, because the mean of its divisors is an integer number (252287003346).

Almost surely, 2^{1009145919191} is an apocalyptic number.

1009145919191 is a deficient number, since it is larger than the sum of its proper divisors (2094193).

1009145919191 is an equidigital number, since it uses as much as digits as its factorization.

1009145919191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094192.

The product of its (nonzero) digits is 131220, while the sum is 50.

The spelling of 1009145919191 in words is "one trillion, nine billion, one hundred forty-five million, nine hundred nineteen thousand, one hundred ninety-one".