1008191 has 4 divisors (see below), whose sum is σ = 1012752. Its totient is φ = 1003632.

The previous prime is 1008187. The next prime is 1008193. The reversal of 1008191 is 1918001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1918001 = 31 ⋅61871.

It is a cyclic number.

It is not a de Polignac number, because 1008191 - 2² = 1008187 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 (1008193) 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 in 3 ways as a sum of consecutive naturals, for example, 1931 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (253188).

2^1008191 is an apocalyptic number.

1008191 is a deficient number, since it is larger than the sum of its proper divisors (4561).

1008191 is an equidigital number, since it uses as much as digits as its factorization.

1008191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4560.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1008191 is about 1004.0871476122. The cubic root of 1008191 is about 100.2722912352.

The spelling of 1008191 in words is "one million, eight thousand, one hundred ninety-one".