1491191 has 8 divisors (see below), whose sum is σ = 1615824. Its totient is φ = 1368000.

The previous prime is 1491179. The next prime is 1491199. The reversal of 1491191 is 1911941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1491191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3035 + ... + 3491.

It is an arithmetic number, because the mean of its divisors is an integer number (201978).

2^1491191 is an apocalyptic number.

1491191 is a deficient number, since it is larger than the sum of its proper divisors (124633).

1491191 is a wasteful number, since it uses less digits than its factorization.

1491191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721.

The product of its digits is 324, while the sum is 26.

The square root of 1491191 is about 1221.1433167323. The cubic root of 1491191 is about 114.2468999888.

The spelling of 1491191 in words is "one million, four hundred ninety-one thousand, one hundred ninety-one".