245961 has 6 divisors (see below), whose sum is σ = 355290. Its totient is φ = 163968.

The previous prime is 245941. The next prime is 245963. The reversal of 245961 is 169542.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 38025 = 456^2 + 195^2 .

It is not a de Polignac number, because 245961 - 2⁶ = 245897 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245961.

It is not an unprimeable number, because it can be changed into a prime (245963) 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, 13656 + ... + 13673.

It is an arithmetic number, because the mean of its divisors is an integer number (59215).

2²⁴⁵⁹⁶¹ is an apocalyptic number.

It is an amenable number.

245961 is a deficient number, since it is larger than the sum of its proper divisors (109329).

245961 is a wasteful number, since it uses less digits than its factorization.

245961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27335 (or 27332 counting only the distinct ones).

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

The square root of 245961 is about 495.9445533525. The cubic root of 245961 is about 62.6549541764.

The spelling of 245961 in words is "two hundred forty-five thousand, nine hundred sixty-one".