245691 has 6 divisors (see below), whose sum is σ = 354900. Its totient is φ = 163788.

The previous prime is 245683. The next prime is 245711. The reversal of 245691 is 196542.

It is not a de Polignac number, because 245691 - 2³ = 245683 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245691.

It is not an unprimeable number, because it can be changed into a prime (245621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13641 + ... + 13658.

It is an arithmetic number, because the mean of its divisors is an integer number (59150).

2²⁴⁵⁶⁹¹ is an apocalyptic number.

245691 is a deficient number, since it is larger than the sum of its proper divisors (109209).

245691 is a wasteful number, since it uses less digits than its factorization.

245691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27305 (or 27302 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 245691 is about 495.6722707596. The cubic root of 245691 is about 62.6320196035.

The spelling of 245691 in words is "two hundred forty-five thousand, six hundred ninety-one".