245557 has 6 divisors (see below), whose sum is σ = 266082. Its totient is φ = 226512.

The previous prime is 245533. The next prime is 245561. The reversal of 245557 is 755542.

It can be written as a sum of positive squares in 3 ways, for example, as 23716 + 221841 = 154^2 + 471^2 .

It is a de Polignac number, because none of the positive numbers 2^k-245557 is a prime.

It is a Duffinian number.

245557 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (44347).

2²⁴⁵⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

245557 is a deficient number, since it is larger than the sum of its proper divisors (20525).

245557 is a wasteful number, since it uses less digits than its factorization.

245557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479 (or 1466 counting only the distinct ones).

The product of its digits is 7000, while the sum is 28.

The square root of 245557 is about 495.5370823662. The cubic root of 245557 is about 62.6206310207.

The spelling of 245557 in words is "two hundred forty-five thousand, five hundred fifty-seven".