345691 has 4 divisors (see below), whose sum is σ = 355072. Its totient is φ = 336312.

The previous prime is 345689. The next prime is 345701. The reversal of 345691 is 196543.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 345691 - 2¹ = 345689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4635 + ... + 4708.

It is an arithmetic number, because the mean of its divisors is an integer number (88768).

2³⁴⁵⁶⁹¹ is an apocalyptic number.

345691 is a deficient number, since it is larger than the sum of its proper divisors (9381).

345691 is an equidigital number, since it uses as much as digits as its factorization.

345691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380.

The product of its digits is 3240, while the sum is 28.

The square root of 345691 is about 587.9549302455. The cubic root of 345691 is about 70.1825845658.

It can be divided in two parts, 345 and 691, that multiplied together give a triangular number (238395 = T₆₉₀).

The spelling of 345691 in words is "three hundred forty-five thousand, six hundred ninety-one".