351681 has 8 divisors (see below), whose sum is σ = 511584. Its totient is φ = 213120.

The previous prime is 351667. The next prime is 351691. The reversal of 351681 is 186153.

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

It is not a de Polignac number, because 351681 - 2¹⁰ = 350657 is a prime.

It is a super-2 number, since 2×351681² = 247359051522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

351681 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 351681.

It is not an unprimeable number, because it can be changed into a prime (351661) 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, 5296 + ... + 5361.

It is an arithmetic number, because the mean of its divisors is an integer number (63948).

2³⁵¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

351681 is a deficient number, since it is larger than the sum of its proper divisors (159903).

351681 is a wasteful number, since it uses less digits than its factorization.

351681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10671.

The product of its digits is 720, while the sum is 24.

The square root of 351681 is about 593.0269808365. The cubic root of 351681 is about 70.5856310722.

The spelling of 351681 in words is "three hundred fifty-one thousand, six hundred eighty-one".