345445431209 has 4 divisors (see below), whose sum is σ = 357357342660. Its totient is φ = 333533519760.

The previous prime is 345445431203. The next prime is 345445431263. The reversal of 345445431209 is 902134544543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902134544543 = 76511 ⋅11790913.

It can be written as a sum of positive squares in 2 ways, for example, as 149036918809 + 196408512400 = 386053^2 + 443180^2 .

It is a cyclic number.

It is not a de Polignac number, because 345445431209 - 2³⁶ = 276725954473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345445431209.

It is not an unprimeable number, because it can be changed into a prime (345445431203) 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, 5955955682 + ... + 5955955739.

It is an arithmetic number, because the mean of its divisors is an integer number (89339335665).

Almost surely, 2^345445431209 is an apocalyptic number.

It is an amenable number.

345445431209 is a deficient number, since it is larger than the sum of its proper divisors (11911911451).

345445431209 is a wasteful number, since it uses less digits than its factorization.

345445431209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911911450.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 345445431209 in words is "three hundred forty-five billion, four hundred forty-five million, four hundred thirty-one thousand, two hundred nine".