243401087 has 4 divisors (see below), whose sum is σ = 257718816. Its totient is φ = 229083360.

The previous prime is 243401071. The next prime is 243401107. The reversal of 243401087 is 780104342.

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 243401087 - 2⁴ = 243401071 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 (243406087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7158839 + ... + 7158872.

It is an arithmetic number, because the mean of its divisors is an integer number (64429704).

Almost surely, 2^243401087 is an apocalyptic number.

243401087 is a deficient number, since it is larger than the sum of its proper divisors (14317729).

243401087 is a wasteful number, since it uses less digits than its factorization.

243401087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14317728.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 243401087 is about 15601.3168354469. The cubic root of 243401087 is about 624.3682892950.

The spelling of 243401087 in words is "two hundred forty-three million, four hundred one thousand, eighty-seven".