1421425651 has 4 divisors (see below), whose sum is σ = 1421955000. Its totient is φ = 1420896304.

The previous prime is 1421425631. The next prime is 1421425661. The reversal of 1421425651 is 1565241241.

It is a happy number.

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 1421425651 - 2⁵ = 1421425619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421425631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260626 + ... + 266023.

It is an arithmetic number, because the mean of its divisors is an integer number (355488750).

Almost surely, 2^1421425651 is an apocalyptic number.

1421425651 is a deficient number, since it is larger than the sum of its proper divisors (529349).

1421425651 is an equidigital number, since it uses as much as digits as its factorization.

1421425651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529348.

The product of its digits is 9600, while the sum is 31.

The square root of 1421425651 is about 37701.7990419555. The cubic root of 1421425651 is about 1124.3668934250.

Adding to 1421425651 its reverse (1565241241), we get a palindrome (2986666892).

The spelling of 1421425651 in words is "one billion, four hundred twenty-one million, four hundred twenty-five thousand, six hundred fifty-one".