1684061009 has 4 divisors (see below), whose sum is σ = 1699511220. Its totient is φ = 1668610800.

The previous prime is 1684060997. The next prime is 1684061011. The reversal of 1684061009 is 9001604861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1350195025 + 333865984 = 36745^2 + 18272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684061009 - 2⁴ = 1684060993 is a prime.

It is a super-2 number, since 2×1684061009² = 5672122964068196162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1684061009.

It is not an unprimeable number, because it can be changed into a prime (1684061809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7724942 + ... + 7725159.

It is an arithmetic number, because the mean of its divisors is an integer number (424877805).

Almost surely, 2^1684061009 is an apocalyptic number.

It is an amenable number.

1684061009 is a deficient number, since it is larger than the sum of its proper divisors (15450211).

1684061009 is a wasteful number, since it uses less digits than its factorization.

1684061009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15450210.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 1684061009 is about 41037.3123998149. The cubic root of 1684061009 is about 1189.7414896412.

The spelling of 1684061009 in words is "one billion, six hundred eighty-four million, sixty-one thousand, nine".