243681607 has 24 divisors (see below), whose sum is σ = 274927488. Its totient is φ = 215654400.

The previous prime is 243681569. The next prime is 243681611. The reversal of 243681607 is 706186342.

It is not a de Polignac number, because 243681607 - 2²³ = 235292999 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 (243681637) 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 23 ways as a sum of consecutive naturals, for example, 1011007 + ... + 1011247.

It is an arithmetic number, because the mean of its divisors is an integer number (11455312).

Almost surely, 2^243681607 is an apocalyptic number.

243681607 is a deficient number, since it is larger than the sum of its proper divisors (31245881).

243681607 is a wasteful number, since it uses less digits than its factorization.

243681607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 243681607 is about 15610.3045133655. The cubic root of 243681607 is about 624.6080589029.

The spelling of 243681607 in words is "two hundred forty-three million, six hundred eighty-one thousand, six hundred seven".