1681584069 has 16 divisors (see below), whose sum is σ = 2466160704. Its totient is φ = 1019139440.

The previous prime is 1681584061. The next prime is 1681584083. The reversal of 1681584069 is 9604851861.

It is not a de Polignac number, because 1681584069 - 2³ = 1681584061 is a prime.

It is a super-2 number, since 2×1681584069² = 5655449962229193522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681584061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206574 + ... + 214559.

It is an arithmetic number, because the mean of its divisors is an integer number (154135044).

Almost surely, 2^1681584069 is an apocalyptic number.

It is an amenable number.

1681584069 is a deficient number, since it is larger than the sum of its proper divisors (784576635).

1681584069 is an equidigital number, since it uses as much as digits as its factorization.

1681584069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421169 (or 421147 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 1681584069 is about 41007.1221740809. The cubic root of 1681584069 is about 1189.1579074074.

The spelling of 1681584069 in words is "one billion, six hundred eighty-one million, five hundred eighty-four thousand, sixty-nine".