340445881 has 2 divisors, whose sum is σ = 340445882. Its totient is φ = 340445880.

The previous prime is 340445879. The next prime is 340445891. The reversal of 340445881 is 188544043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320732281 + 19713600 = 17909^2 + 4440^2 .

It is a cyclic number.

It is not a de Polignac number, because 340445881 - 2¹ = 340445879 is a prime.

It is a super-2 number, since 2×340445881² = 231806795779732322, which contains 22 as substring.

Together with 340445879, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_18317485 and since 340445881 and 18317485 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 340445881.

It is not a weakly prime, because it can be changed into another prime (340445891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170222940 + 170222941.

It is an arithmetic number, because the mean of its divisors is an integer number (170222941).

Almost surely, 2^340445881 is an apocalyptic number.

It is an amenable number.

340445881 is a deficient number, since it is larger than the sum of its proper divisors (1).

340445881 is an equidigital number, since it uses as much as digits as its factorization.

340445881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 340445881 is about 18451.1755994029. The cubic root of 340445881 is about 698.2581734484.

The spelling of 340445881 in words is "three hundred forty million, four hundred forty-five thousand, eight hundred eighty-one".