1012191 has 4 divisors (see below), whose sum is σ = 1349592. Its totient is φ = 674792.

The previous prime is 1012189. The next prime is 1012201. The reversal of 1012191 is 1912101.

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 1012191 - 2¹ = 1012189 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012171) 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, 168696 + ... + 168701.

It is an arithmetic number, because the mean of its divisors is an integer number (337398).

2^1012191 is an apocalyptic number.

1012191 is a deficient number, since it is larger than the sum of its proper divisors (337401).

1012191 is an equidigital number, since it uses as much as digits as its factorization.

1012191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337400.

The product of its (nonzero) digits is 18, while the sum is 15.

The square root of 1012191 is about 1006.0770348239. The cubic root of 1012191 is about 100.4047264220.

Adding to 1012191 its reverse (1912101), we get a palindrome (2924292).

The spelling of 1012191 in words is "one million, twelve thousand, one hundred ninety-one".