243516253 has 8 divisors (see below), whose sum is σ = 251655680. Its totient is φ = 235394640.

The previous prime is 243516241. The next prime is 243516283. The reversal of 243516253 is 352615342.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 243516253 - 2²⁵ = 209961821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243516283) 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, 26968 + ... + 34846.

It is an arithmetic number, because the mean of its divisors is an integer number (31456960).

Almost surely, 2^243516253 is an apocalyptic number.

It is an amenable number.

243516253 is a deficient number, since it is larger than the sum of its proper divisors (8139427).

243516253 is an equidigital number, since it uses as much as digits as its factorization.

243516253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8907.

The product of its digits is 21600, while the sum is 31.

The square root of 243516253 is about 15605.0073053491. The cubic root of 243516253 is about 624.4667477166.

The spelling of 243516253 in words is "two hundred forty-three million, five hundred sixteen thousand, two hundred fifty-three".