243451 has 8 divisors (see below), whose sum is σ = 267344. Its totient is φ = 220320.

The previous prime is 243437. The next prime is 243461. The reversal of 243451 is 154342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243451 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (243401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640 + ... + 946.

It is an arithmetic number, because the mean of its divisors is an integer number (33418).

2²⁴³⁴⁵¹ is an apocalyptic number.

243451 is a deficient number, since it is larger than the sum of its proper divisors (23893).

243451 is a wasteful number, since it uses less digits than its factorization.

243451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its digits is 480, while the sum is 19.

The square root of 243451 is about 493.4075394641. The cubic root of 243451 is about 62.4410965035.

Adding to 243451 its reverse (154342), we get a palindrome (397793).

It can be divided in two parts, 2434 and 51, that added together give a triangular number (2485 = T₇₀).

The spelling of 243451 in words is "two hundred forty-three thousand, four hundred fifty-one".