345336581 has 2 divisors, whose sum is σ = 345336582. Its totient is φ = 345336580.

The previous prime is 345336491. The next prime is 345336583. The reversal of 345336581 is 185633543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332734081 + 12602500 = 18241^2 + 3550^2 .

It is an emirp because it is prime and its reverse (185633543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345336581 is a prime.

It is a super-2 number, since 2×345336581² = 238514708353539122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 345336583, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345336583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172668290 + 172668291.

It is an arithmetic number, because the mean of its divisors is an integer number (172668291).

Almost surely, 2^345336581 is an apocalyptic number.

It is an amenable number.

345336581 is a deficient number, since it is larger than the sum of its proper divisors (1).

345336581 is an equidigital number, since it uses as much as digits as its factorization.

345336581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The square root of 345336581 is about 18583.2338681942. The cubic root of 345336581 is about 701.5859151326.

It can be divided in two parts, 34533 and 6581, that added together give a palindrome (41114).

The spelling of 345336581 in words is "three hundred forty-five million, three hundred thirty-six thousand, five hundred eighty-one".