345505243 has 4 divisors (see below), whose sum is σ = 345547440. Its totient is φ = 345463048.

The previous prime is 345505231. The next prime is 345505249. The reversal of 345505243 is 342505543.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 342505543 = 163 ⋅2101261.

It is a cyclic number.

It is not a de Polignac number, because 345505243 - 2¹⁷ = 345374171 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345505249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4423 + ... + 26656.

It is an arithmetic number, because the mean of its divisors is an integer number (86386860).

Almost surely, 2^345505243 is an apocalyptic number.

345505243 is a deficient number, since it is larger than the sum of its proper divisors (42197).

345505243 is a wasteful number, since it uses less digits than its factorization.

345505243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42196.

The product of its (nonzero) digits is 36000, while the sum is 31.

The square root of 345505243 is about 18587.7713295597. The cubic root of 345505243 is about 701.7001144685.

It can be divided in two parts, 34550 and 5243, that added together give a palindrome (39793).

The spelling of 345505243 in words is "three hundred forty-five million, five hundred five thousand, two hundred forty-three".