345840281 has 2 divisors, whose sum is σ = 345840282. Its totient is φ = 345840280.

The previous prime is 345840277. The next prime is 345840301. The reversal of 345840281 is 182048543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341658256 + 4182025 = 18484^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 345840281 - 2² = 345840277 is a prime.

It is a super-3 number, since 3×345840281³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (345840181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172920140 + 172920141.

It is an arithmetic number, because the mean of its divisors is an integer number (172920141).

Almost surely, 2^345840281 is an apocalyptic number.

It is an amenable number.

345840281 is a deficient number, since it is larger than the sum of its proper divisors (1).

345840281 is an equidigital number, since it uses as much as digits as its factorization.

345840281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 345840281 is about 18596.7814688456. The cubic root of 345840281 is about 701.9268551209.

The spelling of 345840281 in words is "three hundred forty-five million, eight hundred forty thousand, two hundred eighty-one".