1643883461 has 8 divisors (see below), whose sum is σ = 1793633664. Its totient is φ = 1494184320.

The previous prime is 1643883443. The next prime is 1643883463.

1643883461 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1643883461 - 2¹⁴ = 1643867077 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 (1643883463) 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 7 ways as a sum of consecutive naturals, for example, 91925 + ... + 108341.

It is an arithmetic number, because the mean of its divisors is an integer number (224204208).

Almost surely, 2^1643883461 is an apocalyptic number.

1643883461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1643883461 is a deficient number, since it is larger than the sum of its proper divisors (149750203).

1643883461 is a wasteful number, since it uses less digits than its factorization.

1643883461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25531.

The product of its digits is 331776, while the sum is 44.

The square root of 1643883461 is about 40544.8327287214. The cubic root of 1643883461 is about 1180.2038001435.

It can be divided in two parts, 16438 and 83461, that added together give a palindrome (99899).

The spelling of 1643883461 in words is "one billion, six hundred forty-three million, eight hundred eighty-three thousand, four hundred sixty-one".