1491921 has 12 divisors (see below), whose sum is σ = 2201472. Its totient is φ = 973176.

The previous prime is 1491913. The next prime is 1491929. The reversal of 1491921 is 1291941.

It is an interprime number because it is at equal distance from previous prime (1491913) and next prime (1491929).

It is not a de Polignac number, because 1491921 - 2³ = 1491913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1491929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1341 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (183456).

2^1491921 is an apocalyptic number.

It is an amenable number.

1491921 is a deficient number, since it is larger than the sum of its proper divisors (709551).

1491921 is a wasteful number, since it uses less digits than its factorization.

1491921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580 (or 3577 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 1491921 is about 1221.4421803753. The cubic root of 1491921 is about 114.2655398169.

The spelling of 1491921 in words is "one million, four hundred ninety-one thousand, nine hundred twenty-one".