345351921 has 4 divisors (see below), whose sum is σ = 460469232. Its totient is φ = 230234612.

The previous prime is 345351887. The next prime is 345351943. The reversal of 345351921 is 129153543.

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: 129153543 = 3 ⋅43051181.

It is a cyclic number.

It is not a de Polignac number, because 345351921 - 2¹⁸ = 345089777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345351971) 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, 57558651 + ... + 57558656.

It is an arithmetic number, because the mean of its divisors is an integer number (115117308).

Almost surely, 2^345351921 is an apocalyptic number.

It is an amenable number.

345351921 is a deficient number, since it is larger than the sum of its proper divisors (115117311).

345351921 is a wasteful number, since it uses less digits than its factorization.

345351921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115117310.

The product of its digits is 16200, while the sum is 33.

The square root of 345351921 is about 18583.6466012459. The cubic root of 345351921 is about 701.5963032285.

The spelling of 345351921 in words is "three hundred forty-five million, three hundred fifty-one thousand, nine hundred twenty-one".