345954509 has 4 divisors (see below), whose sum is σ = 350333760. Its totient is φ = 341575260.

The previous prime is 345954493. The next prime is 345954547. The reversal of 345954509 is 905459543.

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: 905459543 = 4297 ⋅210719.

It is a cyclic number.

It is not a de Polignac number, because 345954509 - 2⁴ = 345954493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 345954509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345954599) 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, 2189507 + ... + 2189664.

It is an arithmetic number, because the mean of its divisors is an integer number (87583440).

Almost surely, 2^345954509 is an apocalyptic number.

It is an amenable number.

345954509 is a deficient number, since it is larger than the sum of its proper divisors (4379251).

345954509 is an equidigital number, since it uses as much as digits as its factorization.

345954509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379250.

The product of its (nonzero) digits is 486000, while the sum is 44.

The square root of 345954509 is about 18599.8523918874. The cubic root of 345954509 is about 702.0041267009.

The spelling of 345954509 in words is "three hundred forty-five million, nine hundred fifty-four thousand, five hundred nine".