1684311861 has 8 divisors (see below), whose sum is σ = 2279268064. Its totient is φ = 1106115120.

The previous prime is 1684311859. The next prime is 1684311869. The reversal of 1684311861 is 1681134861.

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

It is not a de Polignac number, because 1684311861 - 2¹ = 1684311859 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 (1684311869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4189630 + ... + 4190031.

It is an arithmetic number, because the mean of its divisors is an integer number (284908508).

Almost surely, 2^1684311861 is an apocalyptic number.

It is an amenable number.

1684311861 is a deficient number, since it is larger than the sum of its proper divisors (594956203).

1684311861 is an equidigital number, since it uses as much as digits as its factorization.

1684311861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8379731.

The product of its digits is 27648, while the sum is 39.

The square root of 1684311861 is about 41040.3686752446. The cubic root of 1684311861 is about 1189.8005599902.

The spelling of 1684311861 in words is "one billion, six hundred eighty-four million, three hundred eleven thousand, eight hundred sixty-one".