345625281 has 9 divisors (see below), whose sum is σ = 499317091. Its totient is φ = 230379672.

The previous prime is 345625279. The next prime is 345625327. The reversal of 345625281 is 182526543.

The square root of 345625281 is 18591.

It is a perfect power (a square), and thus also a powerful number.

345625281 is a `hidden beast` number, since 3 + 4 + 5 + 625 + 28 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135839025 + 209786256 = 11655^2 + 14484^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 345625281 - 2¹ = 345625279 is a prime.

It is a super-2 number, since 2×345625281² = 238913669732657922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345625261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52675 + ... + 58871.

Almost surely, 2^345625281 is an apocalyptic number.

345625281 is the 18591-st square number.

345625281 is the 9296-th centered octagonal number.

It is an amenable number.

345625281 is a deficient number, since it is larger than the sum of its proper divisors (153691810).

345625281 is an frugal number, since it uses more digits than its factorization.

345625281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12400 (or 6200 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The cubic root of 345625281 is about 701.7813683493.

Multiplying 345625281 by its sum of digits (36), we get a square (12442510116 = 111546²).

Multiplying 345625281 by its product of digits (57600), we get a square (19908016185600 = 4461840²).

The spelling of 345625281 in words is "three hundred forty-five million, six hundred twenty-five thousand, two hundred eighty-one".