243471397 has 4 divisors (see below), whose sum is σ = 262199980. Its totient is φ = 224742816.

The previous prime is 243471311. The next prime is 243471401. The reversal of 243471397 is 793174342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77422401 + 166048996 = 8799^2 + 12886^2 .

It is a cyclic number.

It is not a de Polignac number, because 243471397 - 2¹¹ = 243469349 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 (243474397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9364272 + ... + 9364297.

It is an arithmetic number, because the mean of its divisors is an integer number (65549995).

Almost surely, 2^243471397 is an apocalyptic number.

It is an amenable number.

243471397 is a deficient number, since it is larger than the sum of its proper divisors (18728583).

243471397 is a wasteful number, since it uses less digits than its factorization.

243471397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18728582.

The product of its digits is 127008, while the sum is 40.

The square root of 243471397 is about 15603.5700081744. The cubic root of 243471397 is about 624.4284028421.

The spelling of 243471397 in words is "two hundred forty-three million, four hundred seventy-one thousand, three hundred ninety-seven".