243256461 has 16 divisors (see below), whose sum is σ = 379298304. Its totient is φ = 135770544.

The previous prime is 243256457. The next prime is 243256501. The reversal of 243256461 is 164652342.

It is not a de Polignac number, because 243256461 - 2² = 243256457 is a prime.

It is a super-3 number, since 3×243256461³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243256421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133791 + ... + 135596.

It is an arithmetic number, because the mean of its divisors is an integer number (23706144).

Almost surely, 2^243256461 is an apocalyptic number.

243256461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243256461 is a deficient number, since it is larger than the sum of its proper divisors (136041843).

243256461 is a wasteful number, since it uses less digits than its factorization.

243256461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269440.

The product of its digits is 34560, while the sum is 33.

The square root of 243256461 is about 15596.6810892574. The cubic root of 243256461 is about 624.2446007497.

The spelling of 243256461 in words is "two hundred forty-three million, two hundred fifty-six thousand, four hundred sixty-one".