1461648821 has 4 divisors (see below), whose sum is σ = 1461833772. Its totient is φ = 1461463872.

The previous prime is 1461648737. The next prime is 1461648829. The reversal of 1461648821 is 1288461641.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1049112100 + 412536721 = 32390^2 + 20311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1461648821 - 2¹⁰ = 1461647797 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 (1461648829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80066 + ... + 96611.

It is an arithmetic number, because the mean of its divisors is an integer number (365458443).

Almost surely, 2^1461648821 is an apocalyptic number.

It is an amenable number.

1461648821 is a deficient number, since it is larger than the sum of its proper divisors (184951).

1461648821 is an equidigital number, since it uses as much as digits as its factorization.

1461648821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184950.

The product of its digits is 73728, while the sum is 41.

The square root of 1461648821 is about 38231.5160698605. The cubic root of 1461648821 is about 1134.8740882532.

The spelling of 1461648821 in words is "one billion, four hundred sixty-one million, six hundred forty-eight thousand, eight hundred twenty-one".