243401897 has 4 divisors (see below), whose sum is σ = 243441156. Its totient is φ = 243362640.

The previous prime is 243401881. The next prime is 243401911. The reversal of 243401897 is 798104342.

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 41165056 + 202236841 = 6416^2 + 14221^2 .

It is a cyclic number.

It is not a de Polignac number, because 243401897 - 2⁴ = 243401881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243401897.

It is not an unprimeable number, because it can be changed into a prime (243401867) 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, 8054 + ... + 23487.

It is an arithmetic number, because the mean of its divisors is an integer number (60860289).

Almost surely, 2^243401897 is an apocalyptic number.

It is an amenable number.

243401897 is a deficient number, since it is larger than the sum of its proper divisors (39259).

243401897 is an equidigital number, since it uses as much as digits as its factorization.

243401897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39258.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 243401897 is about 15601.3427947725. The cubic root of 243401897 is about 624.3689818936.

The spelling of 243401897 in words is "two hundred forty-three million, four hundred one thousand, eight hundred ninety-seven".