345221361 has 12 divisors (see below), whose sum is σ = 498907188. Its totient is φ = 230030304.

The previous prime is 345221311. The next prime is 345221411. The reversal of 345221361 is 163122543.

345221361 is a `hidden beast` number, since 3 + 4 + 522 + 136 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (345221311) and next prime (345221411).

It can be written as a sum of positive squares in 2 ways, for example, as 196868961 + 148352400 = 14031^2 + 12180^2 .

It is not a de Polignac number, because 345221361 - 2¹⁵ = 345188593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (345221311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11251 + ... + 28583.

It is an arithmetic number, because the mean of its divisors is an integer number (41575599).

Almost surely, 2^345221361 is an apocalyptic number.

It is an amenable number.

345221361 is a deficient number, since it is larger than the sum of its proper divisors (153685827).

345221361 is a wasteful number, since it uses less digits than its factorization.

345221361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19552 (or 19549 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 345221361 is about 18580.1335032879. The cubic root of 345221361 is about 701.5078794562.

The spelling of 345221361 in words is "three hundred forty-five million, two hundred twenty-one thousand, three hundred sixty-one".