1421551 has 4 divisors (see below), whose sum is σ = 1470600. Its totient is φ = 1372504.

The previous prime is 1421549. The next prime is 1421569. The reversal of 1421551 is 1551241.

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 1421551 - 2¹ = 1421549 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24481 + ... + 24538.

It is an arithmetic number, because the mean of its divisors is an integer number (367650).

2^1421551 is an apocalyptic number.

1421551 is a deficient number, since it is larger than the sum of its proper divisors (49049).

1421551 is an equidigital number, since it uses as much as digits as its factorization.

1421551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49048.

The product of its digits is 200, while the sum is 19.

The square root of 1421551 is about 1192.2881363161. The cubic root of 1421551 is about 112.4399943371.

Adding to 1421551 its reverse (1551241), we get a palindrome (2972792).

The spelling of 1421551 in words is "one million, four hundred twenty-one thousand, five hundred fifty-one".