345078109 has 2 divisors, whose sum is σ = 345078110. Its totient is φ = 345078108.

The previous prime is 345078091. The next prime is 345078137. The reversal of 345078109 is 901870543.

Together with previous prime (345078091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208889209 + 136188900 = 14453^2 + 11670^2 .

It is a cyclic number.

It is not a de Polignac number, because 345078109 - 2¹⁹ = 344553821 is a prime.

It is a super-2 number, since 2×345078109² = 238157802622031762, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345072109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172539054 + 172539055.

It is an arithmetic number, because the mean of its divisors is an integer number (172539055).

Almost surely, 2^345078109 is an apocalyptic number.

It is an amenable number.

345078109 is a deficient number, since it is larger than the sum of its proper divisors (1).

345078109 is an equidigital number, since it uses as much as digits as its factorization.

345078109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 345078109 is about 18576.2781256096. The cubic root of 345078109 is about 701.4108341771.

The spelling of 345078109 in words is "three hundred forty-five million, seventy-eight thousand, one hundred nine".