351989 has 6 divisors (see below), whose sum is σ = 387030. Its totient is φ = 319880.

The previous prime is 351971. The next prime is 351991. The reversal of 351989 is 989153.

351989 = 38² + 39² + ... + 103².

It can be written as a sum of positive squares in only one way, i.e., 339889 + 12100 = 583^2 + 110^2 .

It is not a de Polignac number, because 351989 - 2⁸ = 351733 is a prime.

It is a super-2 number, since 2×351989² = 247792512242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1334 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (64505).

2³⁵¹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

351989 is a deficient number, since it is larger than the sum of its proper divisors (35041).

351989 is a wasteful number, since it uses less digits than its factorization.

351989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931 (or 2920 counting only the distinct ones).

The product of its digits is 9720, while the sum is 35.

The square root of 351989 is about 593.2866086471. The cubic root of 351989 is about 70.6062312096.

The spelling of 351989 in words is "three hundred fifty-one thousand, nine hundred eighty-nine".