1010001009191 has 4 divisors (see below), whose sum is σ = 1010003911800. Its totient is φ = 1009998106584.

The previous prime is 1010001009161. The next prime is 1010001009239. The reversal of 1010001009191 is 1919001000101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1010001009191 - 2¹⁰ = 1010001008167 is a prime.

It is a super-3 number, since 3×1010001009191³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010001009161) 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, 844901 + ... + 1653438.

It is an arithmetic number, because the mean of its divisors is an integer number (252500977950).

Almost surely, 2^{1010001009191} is an apocalyptic number.

1010001009191 is a deficient number, since it is larger than the sum of its proper divisors (2902609).

1010001009191 is an equidigital number, since it uses as much as digits as its factorization.

1010001009191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902608.

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

Adding to 1010001009191 its reverse (1919001000101), we get a palindrome (2929002009292).

The spelling of 1010001009191 in words is "one trillion, ten billion, one million, nine thousand, one hundred ninety-one".