1421591 has 6 divisors (see below), whose sum is σ = 1510440. Its totient is φ = 1337696.

The previous prime is 1421569. The next prime is 1421603. The reversal of 1421591 is 1951241.

It is a happy number.

It is not a de Polignac number, because 1421591 - 2⁶ = 1421527 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 (1421501) 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 5 ways as a sum of consecutive naturals, for example, 2171 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (251740).

2^1421591 is an apocalyptic number.

1421591 is a deficient number, since it is larger than the sum of its proper divisors (88849).

1421591 is an equidigital number, since it uses as much as digits as its factorization.

1421591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953 (or 4936 counting only the distinct ones).

The product of its digits is 360, while the sum is 23.

The square root of 1421591 is about 1192.3049106667. The cubic root of 1421591 is about 112.4410489499.

The spelling of 1421591 in words is "one million, four hundred twenty-one thousand, five hundred ninety-one".