345289691 has 2 divisors, whose sum is σ = 345289692. Its totient is φ = 345289690.

The previous prime is 345289673. The next prime is 345289697. The reversal of 345289691 is 196982543.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345289691 is a prime.

It is not a weakly prime, because it can be changed into another prime (345289697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172644845 + 172644846.

It is an arithmetic number, because the mean of its divisors is an integer number (172644846).

Almost surely, 2^345289691 is an apocalyptic number.

345289691 is a deficient number, since it is larger than the sum of its proper divisors (1).

345289691 is an equidigital number, since it uses as much as digits as its factorization.

345289691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The square root of 345289691 is about 18581.9722042629. The cubic root of 345289691 is about 701.5541597820.

The spelling of 345289691 in words is "three hundred forty-five million, two hundred eighty-nine thousand, six hundred ninety-one".