345399121 has 4 divisors (see below), whose sum is σ = 349280100. Its totient is φ = 341518144.

The previous prime is 345399083. The next prime is 345399133. The reversal of 345399121 is 121993543.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183982096 + 161417025 = 13564^2 + 12705^2 .

It is a cyclic number.

It is not a de Polignac number, because 345399121 - 2⁹ = 345398609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345399161) 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, 1940356 + ... + 1940533.

It is an arithmetic number, because the mean of its divisors is an integer number (87320025).

Almost surely, 2^345399121 is an apocalyptic number.

It is an amenable number.

345399121 is a deficient number, since it is larger than the sum of its proper divisors (3880979).

345399121 is an equidigital number, since it uses as much as digits as its factorization.

345399121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3880978.

The product of its digits is 29160, while the sum is 37.

The square root of 345399121 is about 18584.9164916068. The cubic root of 345399121 is about 701.6282646713.

It can be divided in two parts, 34539 and 9121, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 345399121 in words is "three hundred forty-five million, three hundred ninety-nine thousand, one hundred twenty-one".