1001213191 has 16 divisors (see below), whose sum is σ = 1113205536. Its totient is φ = 893040000.

The previous prime is 1001213179. The next prime is 1001213203. The reversal of 1001213191 is 1913121001.

It is an interprime number because it is at equal distance from previous prime (1001213179) and next prime (1001213203).

It is not a de Polignac number, because 1001213191 - 2⁵ = 1001213159 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 (1001213141) 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 15 ways as a sum of consecutive naturals, for example, 2496591 + ... + 2496991.

It is an arithmetic number, because the mean of its divisors is an integer number (69575346).

Almost surely, 2^1001213191 is an apocalyptic number.

1001213191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1001213191 is a deficient number, since it is larger than the sum of its proper divisors (111992345).

1001213191 is an frugal number, since it uses more digits than its factorization.

1001213191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 1001213191 is about 31641.9530212659. The cubic root of 1001213191 is about 1000.4042335732.

Adding to 1001213191 its reverse (1913121001), we get a palindrome (2914334192).

The spelling of 1001213191 in words is "one billion, one million, two hundred thirteen thousand, one hundred ninety-one".