243149953 has 4 divisors (see below), whose sum is σ = 243358768. Its totient is φ = 242941140.

The previous prime is 243149947. The next prime is 243149969. The reversal of 243149953 is 359941342.

243149953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243149953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243149983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102651 + ... + 104992.

It is an arithmetic number, because the mean of its divisors is an integer number (60839692).

Almost surely, 2^243149953 is an apocalyptic number.

It is an amenable number.

243149953 is a deficient number, since it is larger than the sum of its proper divisors (208815).

243149953 is a wasteful number, since it uses less digits than its factorization.

243149953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208814.

The product of its digits is 116640, while the sum is 40.

The square root of 243149953 is about 15593.2662710543. The cubic root of 243149953 is about 624.1534805253.

The spelling of 243149953 in words is "two hundred forty-three million, one hundred forty-nine thousand, nine hundred fifty-three".