345240121 has 2 divisors, whose sum is σ = 345240122. Its totient is φ = 345240120.

The previous prime is 345240109. The next prime is 345240139. The reversal of 345240121 is 121042543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315417600 + 29822521 = 17760^2 + 5461^2 .

It is an emirp because it is prime and its reverse (121042543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345240121 - 2¹⁷ = 345109049 is a prime.

It is a super-2 number, since 2×345240121² = 238381482296189282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 345240092 and 345240101.

It is not a weakly prime, because it can be changed into another prime (345243121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172620060 + 172620061.

It is an arithmetic number, because the mean of its divisors is an integer number (172620061).

Almost surely, 2^345240121 is an apocalyptic number.

It is an amenable number.

345240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

345240121 is an equidigital number, since it uses as much as digits as its factorization.

345240121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 345240121 is about 18580.6383367203. The cubic root of 345240121 is about 701.5205863267.

Adding to 345240121 its reverse (121042543), we get a palindrome (466282664).

The spelling of 345240121 in words is "three hundred forty-five million, two hundred forty thousand, one hundred twenty-one".