1681951682 has 32 divisors (see below), whose sum is σ = 2725719552. Its totient is φ = 776438784.

The previous prime is 1681951673. The next prime is 1681951709. The reversal of 1681951682 is 2861591861.

It is a happy number.

It is a super-2 number, since 2×1681951682² = 5657922921165258248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a cake number, because a cake can be divided into 1681951682 parts by 2161 planar cuts.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152498 + ... + 163154.

It is an arithmetic number, because the mean of its divisors is an integer number (85178736).

Almost surely, 2^1681951682 is an apocalyptic number.

1681951682 is a deficient number, since it is larger than the sum of its proper divisors (1043767870).

1681951682 is a wasteful number, since it uses less digits than its factorization.

1681951682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802.

The product of its digits is 207360, while the sum is 47.

The square root of 1681951682 is about 41011.6042358745. The cubic root of 1681951682 is about 1189.2445554798.

The spelling of 1681951682 in words is "one billion, six hundred eighty-one million, nine hundred fifty-one thousand, six hundred eighty-two".