345881 has 2 divisors, whose sum is σ = 345882. Its totient is φ = 345880.

The previous prime is 345869. The next prime is 345887. The reversal of 345881 is 188543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265225 + 80656 = 515^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 345881 - 2⁶ = 345817 is a prime.

It is a super-2 number, since 2×345881² = 239267332322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₂₉₆₄₈ and since 345881 and 29648 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345881.

It is not a weakly prime, because it can be changed into another prime (345887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172940 + 172941.

It is an arithmetic number, because the mean of its divisors is an integer number (172941).

2³⁴⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

345881 is a deficient number, since it is larger than the sum of its proper divisors (1).

345881 is an equidigital number, since it uses as much as digits as its factorization.

345881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

The square root of 345881 is about 588.1164850606. The cubic root of 345881 is about 70.1954402170.

The spelling of 345881 in words is "three hundred forty-five thousand, eight hundred eighty-one".