345917209 has 4 divisors (see below), whose sum is σ = 377364240. Its totient is φ = 314470180.

The previous prime is 345917179. The next prime is 345917213. The reversal of 345917209 is 902719543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902719543 = 11 ⋅82065413.

It is a cyclic number.

It is not a de Polignac number, because 345917209 - 2¹³ = 345909017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345917219) 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, 15723499 + ... + 15723520.

It is an arithmetic number, because the mean of its divisors is an integer number (94341060).

Almost surely, 2^345917209 is an apocalyptic number.

It is an amenable number.

345917209 is a deficient number, since it is larger than the sum of its proper divisors (31447031).

345917209 is a wasteful number, since it uses less digits than its factorization.

345917209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31447030.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 345917209 is about 18598.8496687295. The cubic root of 345917209 is about 701.9788963172.

The spelling of 345917209 in words is "three hundred forty-five million, nine hundred seventeen thousand, two hundred nine".