245451 has 4 divisors (see below), whose sum is σ = 327272. Its totient is φ = 163632.

The previous prime is 245437. The next prime is 245471. The reversal of 245451 is 154542.

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

It is not a de Polignac number, because 245451 - 2⁵ = 245419 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245411) 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 3 ways as a sum of consecutive naturals, for example, 40906 + ... + 40911.

It is an arithmetic number, because the mean of its divisors is an integer number (81818).

2²⁴⁵⁴⁵¹ is an apocalyptic number.

245451 is a deficient number, since it is larger than the sum of its proper divisors (81821).

245451 is an equidigital number, since it uses as much as digits as its factorization.

245451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81820.

The product of its digits is 800, while the sum is 21.

The square root of 245451 is about 495.4301161617. The cubic root of 245451 is about 62.6116192064.

Adding to 245451 its reverse (154542), we get a palindrome (399993).

Subtracting from 245451 its reverse (154542), we obtain a palindrome (90909).

It can be divided in two parts, 245 and 451, that added together give a palindrome (696).

The spelling of 245451 in words is "two hundred forty-five thousand, four hundred fifty-one".