243390513 has 16 divisors (see below), whose sum is σ = 361696320. Its totient is φ = 144677376.

The previous prime is 243390509. The next prime is 243390523. The reversal of 243390513 is 315093342.

It is not a de Polignac number, because 243390513 - 2² = 243390509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243390503) 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, 124620 + ... + 126557.

It is an arithmetic number, because the mean of its divisors is an integer number (22606020).

Almost surely, 2^243390513 is an apocalyptic number.

It is an amenable number.

243390513 is a deficient number, since it is larger than the sum of its proper divisors (118305807).

243390513 is a wasteful number, since it uses less digits than its factorization.

243390513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251216.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 243390513 is about 15600.9779501158. The cubic root of 243390513 is about 624.3592477496.

The spelling of 243390513 in words is "two hundred forty-three million, three hundred ninety thousand, five hundred thirteen".