345521 has 8 divisors (see below), whose sum is σ = 381888. Its totient is φ = 310000.

The previous prime is 345517. The next prime is 345533. The reversal of 345521 is 125543.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 345521 - 2² = 345517 is a prime.

It is a super-2 number, since 2×345521² = 238769522882, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 345493 and 345502.

It is not an unprimeable number, because it can be changed into a prime (345511) 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, 956 + ... + 1266.

It is an arithmetic number, because the mean of its divisors is an integer number (47736).

2³⁴⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

345521 is a deficient number, since it is larger than the sum of its proper divisors (36367).

345521 is a wasteful number, since it uses less digits than its factorization.

345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its digits is 600, while the sum is 20.

The square root of 345521 is about 587.8103435633. The cubic root of 345521 is about 70.1710781476.

It can be divided in two parts, 34 and 5521, that added together give a palindrome (5555).

The spelling of 345521 in words is "three hundred forty-five thousand, five hundred twenty-one".