351809 has 4 divisors (see below), whose sum is σ = 354480. Its totient is φ = 349140.

The previous prime is 351803. The next prime is 351811. The reversal of 351809 is 908153.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351809 is a prime.

It is a deceptive number, since it divides R₃₅₁₈₀₈.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127 + ... + 1404.

It is an arithmetic number, because the mean of its divisors is an integer number (88620).

2³⁵¹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

351809 is a deficient number, since it is larger than the sum of its proper divisors (2671).

351809 is a wasteful number, since it uses less digits than its factorization.

351809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 351809 is about 593.1348919091. The cubic root of 351809 is about 70.5941936283.

The spelling of 351809 in words is "three hundred fifty-one thousand, eight hundred nine".