243397403391 has 8 divisors (see below), whose sum is σ = 324667568304. Its totient is φ = 162196087040.

The previous prime is 243397403351. The next prime is 243397403527. The reversal of 243397403391 is 193304793342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243397403391 - 2²⁶ = 243330294527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243397403391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243397403351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17203890 + ... + 17218031.

It is an arithmetic number, because the mean of its divisors is an integer number (40583446038).

Almost surely, 2^243397403391 is an apocalyptic number.

243397403391 is a deficient number, since it is larger than the sum of its proper divisors (81270164913).

243397403391 is a wasteful number, since it uses less digits than its factorization.

243397403391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34424281.

The product of its (nonzero) digits is 1469664, while the sum is 48.

The spelling of 243397403391 in words is "two hundred forty-three billion, three hundred ninety-seven million, four hundred three thousand, three hundred ninety-one".