345517 has 2 divisors, whose sum is σ = 345518. Its totient is φ = 345516.

The previous prime is 345511. The next prime is 345533. The reversal of 345517 is 715543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259081 + 86436 = 509^2 + 294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345517 is a prime.

345517 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 345491 and 345500.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345517.

It is not a weakly prime, because it can be changed into another prime (345511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172758 + 172759.

It is an arithmetic number, because the mean of its divisors is an integer number (172759).

2³⁴⁵⁵¹⁷ is an apocalyptic number.

It is an amenable number.

345517 is a deficient number, since it is larger than the sum of its proper divisors (1).

345517 is an equidigital number, since it uses as much as digits as its factorization.

345517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 25.

The square root of 345517 is about 587.8069410955. The cubic root of 345517 is about 70.1708073629.

It can be divided in two parts, 34 and 5517, that multiplied together give a triangular number (187578 = T₆₁₂).

The spelling of 345517 in words is "three hundred forty-five thousand, five hundred seventeen".