243412991 has 4 divisors (see below), whose sum is σ = 243565512. Its totient is φ = 243260472.

The previous prime is 243412931. The next prime is 243412993. The reversal of 243412991 is 199214342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243412991 - 2⁶ = 243412927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243412993) 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, 73841 + ... + 77066.

It is an arithmetic number, because the mean of its divisors is an integer number (60891378).

Almost surely, 2^243412991 is an apocalyptic number.

243412991 is a deficient number, since it is larger than the sum of its proper divisors (152521).

243412991 is a wasteful number, since it uses less digits than its factorization.

243412991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152520.

The product of its digits is 15552, while the sum is 35.

The square root of 243412991 is about 15601.6983370401. The cubic root of 243412991 is about 624.3784677745.

The spelling of 243412991 in words is "two hundred forty-three million, four hundred twelve thousand, nine hundred ninety-one".