1421651 has 16 divisors (see below), whose sum is σ = 1824000. Its totient is φ = 1075680.

The previous prime is 1421647. The next prime is 1421663. The reversal of 1421651 is 1561241.

It is a cyclic number.

It is not a de Polignac number, because 1421651 - 2² = 1421647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421611) 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 15 ways as a sum of consecutive naturals, for example, 2600 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (114000).

2^1421651 is an apocalyptic number.

1421651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1421651 is a deficient number, since it is larger than the sum of its proper divisors (402349).

1421651 is a wasteful number, since it uses less digits than its factorization.

1421651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554.

The product of its digits is 240, while the sum is 20.

The square root of 1421651 is about 1192.3300717503. The cubic root of 1421651 is about 112.4426308320.

Adding to 1421651 its reverse (1561241), we get a palindrome (2982892).

The spelling of 1421651 in words is "one million, four hundred twenty-one thousand, six hundred fifty-one".