243415901 has 4 divisors (see below), whose sum is σ = 243453312. Its totient is φ = 243378492.

The previous prime is 243415871. The next prime is 243415919. The reversal of 243415901 is 109514342.

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-243415901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243415951) 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, 6125 + ... + 22898.

It is an arithmetic number, because the mean of its divisors is an integer number (60863328).

Almost surely, 2^243415901 is an apocalyptic number.

It is an amenable number.

243415901 is a deficient number, since it is larger than the sum of its proper divisors (37411).

243415901 is an equidigital number, since it uses as much as digits as its factorization.

243415901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37410.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 243415901 is about 15601.7915958392. The cubic root of 243415901 is about 624.3809559108.

The spelling of 243415901 in words is "two hundred forty-three million, four hundred fifteen thousand, nine hundred one".