345123531 has 24 divisors (see below), whose sum is σ = 525542640. Its totient is φ = 223839936.

The previous prime is 345123481. The next prime is 345123553. The reversal of 345123531 is 135321543.

345123531 is a `hidden beast` number, since 3 + 4 + 5 + 123 + 531 = 666.

It is not a de Polignac number, because 345123531 - 2¹⁵ = 345090763 is a prime.

It is a super-2 number, since 2×345123531² = 238220503299815922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 345123495 and 345123504.

It is not an unprimeable number, because it can be changed into a prime (345123431) 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 23 ways as a sum of consecutive naturals, for example, 32295 + ... + 41631.

It is an arithmetic number, because the mean of its divisors is an integer number (21897610).

Almost surely, 2^345123531 is an apocalyptic number.

345123531 is a deficient number, since it is larger than the sum of its proper divisors (180419109).

345123531 is an equidigital number, since it uses as much as digits as its factorization.

345123531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420 (or 9377 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 345123531 is about 18577.5006661284. The cubic root of 345123531 is about 701.4416079684.

The spelling of 345123531 in words is "three hundred forty-five million, one hundred twenty-three thousand, five hundred thirty-one".