1421634651 has 8 divisors (see below), whose sum is σ = 1896120384. Its totient is φ = 947452680.

The previous prime is 1421634637. The next prime is 1421634661. The reversal of 1421634651 is 1564361241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1421634651 - 2⁷ = 1421634523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1421634601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64785 + ... + 83906.

It is an arithmetic number, because the mean of its divisors is an integer number (237015048).

Almost surely, 2^1421634651 is an apocalyptic number.

1421634651 is a deficient number, since it is larger than the sum of its proper divisors (474485733).

1421634651 is a wasteful number, since it uses less digits than its factorization.

1421634651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151881.

The product of its digits is 17280, while the sum is 33.

The square root of 1421634651 is about 37704.5706910979. The cubic root of 1421634651 is about 1124.4219979988.

Adding to 1421634651 its reverse (1564361241), we get a palindrome (2985995892).

The spelling of 1421634651 in words is "one billion, four hundred twenty-one million, six hundred thirty-four thousand, six hundred fifty-one".