351220 has 24 divisors (see below), whose sum is σ = 781704. Its totient is φ = 132096.

The previous prime is 351217. The next prime is 351223. The reversal of 351220 is 22153.

It is an interprime number because it is at equal distance from previous prime (351217) and next prime (351223).

It can be written as a sum of positive squares in 4 ways, for example, as 169744 + 181476 = 412^2 + 426^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 351220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351223) 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, 177 + ... + 856.

It is an arithmetic number, because the mean of its divisors is an integer number (32571).

2³⁵¹²²⁰ is an apocalyptic number.

It is an amenable number.

351220 is an abundant number, since it is smaller than the sum of its proper divisors (430484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

351220 is a wasteful number, since it uses less digits than its factorization.

351220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 351220 is about 592.6381695436. The cubic root of 351220 is about 70.5547752639.

Adding to 351220 its reverse (22153), we get a palindrome (373373).

The spelling of 351220 in words is "three hundred fifty-one thousand, two hundred twenty".