1641021456 has 80 divisors (see below), whose sum is σ = 4384401920. Its totient is φ = 528353280.

The previous prime is 1641021449. The next prime is 1641021467. The reversal of 1641021456 is 6541201461.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500846 + ... + 1501938.

It is an arithmetic number, because the mean of its divisors is an integer number (54805024).

Almost surely, 2^1641021456 is an apocalyptic number.

1641021456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641021456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2192200960).

1641021456 is an abundant number, since it is smaller than the sum of its proper divisors (2743380464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641021456 is a wasteful number, since it uses less digits than its factorization.

1641021456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1641021456 is about 40509.5230285423. The cubic root of 1641021456 is about 1179.5184897432.

The spelling of 1641021456 in words is "one billion, six hundred forty-one million, twenty-one thousand, four hundred fifty-six".