340512540209 has 4 divisors (see below), whose sum is σ = 340514080500. Its totient is φ = 340510999920.

The previous prime is 340512540149. The next prime is 340512540229. The reversal of 340512540209 is 902045215043.

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 136002376225 + 204510163984 = 368785^2 + 452228^2 .

It is a cyclic number.

It is not a de Polignac number, because 340512540209 - 2²⁰ = 340511491633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340512540229) 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, 368834 + ... + 903915.

It is an arithmetic number, because the mean of its divisors is an integer number (85128520125).

Almost surely, 2^340512540209 is an apocalyptic number.

It is an amenable number.

340512540209 is a deficient number, since it is larger than the sum of its proper divisors (1540291).

340512540209 is a wasteful number, since it uses less digits than its factorization.

340512540209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540290.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 340512540209 in words is "three hundred forty billion, five hundred twelve million, five hundred forty thousand, two hundred nine".