351621 has 12 divisors (see below), whose sum is σ = 527072. Its totient is φ = 234252.

The previous prime is 351599. The next prime is 351643. The reversal of 351621 is 126153.

It is an interprime number because it is at equal distance from previous prime (351599) and next prime (351643).

It is not a de Polignac number, because 351621 - 2¹⁸ = 89477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 351594 and 351603.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 481 + ... + 966.

2³⁵¹⁶²¹ is an apocalyptic number.

It is an amenable number.

351621 is a deficient number, since it is larger than the sum of its proper divisors (175451).

351621 is an equidigital number, since it uses as much as digits as its factorization.

351621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1450 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 351621 is about 592.9763907610. The cubic root of 351621 is about 70.5816166588.

Adding to 351621 its reverse (126153), we get a palindrome (477774).

The spelling of 351621 in words is "three hundred fifty-one thousand, six hundred twenty-one".