1681651369 has 8 divisors (see below), whose sum is σ = 1729325888. Its totient is φ = 1634094000.

The previous prime is 1681651343. The next prime is 1681651379. The reversal of 1681651369 is 9631561861.

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

It is a cyclic number.

It is not a de Polignac number, because 1681651369 - 2⁵ = 1681651337 is a prime.

It is a super-2 number, since 2×1681651369² = 5655902653719148322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681651379) 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, 244 + ... + 57994.

It is an arithmetic number, because the mean of its divisors is an integer number (216165736).

Almost surely, 2^1681651369 is an apocalyptic number.

It is an amenable number.

1681651369 is a deficient number, since it is larger than the sum of its proper divisors (47674519).

1681651369 is an equidigital number, since it uses as much as digits as its factorization.

1681651369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58575.

The product of its digits is 233280, while the sum is 46.

The square root of 1681651369 is about 41007.9427550322. The cubic root of 1681651369 is about 1189.1737712708.

The spelling of 1681651369 in words is "one billion, six hundred eighty-one million, six hundred fifty-one thousand, three hundred sixty-nine".