1641319806 has 64 divisors (see below), whose sum is σ = 3862167552. Its totient is φ = 455287392.

The previous prime is 1641319793. The next prime is 1641319811. The reversal of 1641319806 is 6089131461.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 247425 + ... + 253971.

It is an arithmetic number, because the mean of its divisors is an integer number (60346368).

Almost surely, 2^1641319806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641319806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931083776).

1641319806 is an abundant number, since it is smaller than the sum of its proper divisors (2220847746).

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

1641319806 is a wasteful number, since it uses less digits than its factorization.

1641319806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1641319806 is about 40513.2053286333. The cubic root of 1641319806 is about 1179.5899671789.

The spelling of 1641319806 in words is "one billion, six hundred forty-one million, three hundred nineteen thousand, eight hundred six".