1641621889 has 8 divisors (see below), whose sum is σ = 1667248128. Its totient is φ = 1616173440.

The previous prime is 1641621853. The next prime is 1641621899. The reversal of 1641621889 is 9881261461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641621889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641621899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25777 + ... + 62830.

It is an arithmetic number, because the mean of its divisors is an integer number (208406016).

Almost surely, 2^1641621889 is an apocalyptic number.

It is an amenable number.

1641621889 is a deficient number, since it is larger than the sum of its proper divisors (25626239).

1641621889 is an equidigital number, since it uses as much as digits as its factorization.

1641621889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88895.

The product of its digits is 165888, while the sum is 46.

The square root of 1641621889 is about 40516.9333612503. The cubic root of 1641621889 is about 1179.6623301265.

The spelling of 1641621889 in words is "one billion, six hundred forty-one million, six hundred twenty-one thousand, eight hundred eighty-nine".