351616681 has 16 divisors (see below), whose sum is σ = 388100160. Its totient is φ = 316555200.

The previous prime is 351616673. The next prime is 351616687. The reversal of 351616681 is 186616153.

It is not a de Polignac number, because 351616681 - 2³ = 351616673 is a prime.

It is a super-2 number, since 2×351616681² = 247268580714911522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 351616681.

It is not an unprimeable number, because it can be changed into a prime (351616687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121906 + ... + 124756.

It is an arithmetic number, because the mean of its divisors is an integer number (24256260).

Almost surely, 2^351616681 is an apocalyptic number.

It is an amenable number.

351616681 is a deficient number, since it is larger than the sum of its proper divisors (36483479).

351616681 is a wasteful number, since it uses less digits than its factorization.

351616681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096.

The product of its digits is 25920, while the sum is 37.

The square root of 351616681 is about 18751.4447710036. Note that the first 3 decimals coincide. The cubic root of 351616681 is about 705.8132767037.

The spelling of 351616681 in words is "three hundred fifty-one million, six hundred sixteen thousand, six hundred eighty-one".