243125391 has 4 divisors (see below), whose sum is σ = 324167192. Its totient is φ = 162083592.

The previous prime is 243125339. The next prime is 243125437. The reversal of 243125391 is 193521342.

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

It is not a de Polignac number, because 243125391 - 2⁹ = 243124879 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 (243125291) 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, 40520896 + ... + 40520901.

It is an arithmetic number, because the mean of its divisors is an integer number (81041798).

Almost surely, 2^243125391 is an apocalyptic number.

243125391 is a deficient number, since it is larger than the sum of its proper divisors (81041801).

243125391 is an equidigital number, since it uses as much as digits as its factorization.

243125391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81041800.

The product of its digits is 6480, while the sum is 30.

The square root of 243125391 is about 15592.4786676141. The cubic root of 243125391 is about 624.1324633521.

The spelling of 243125391 in words is "two hundred forty-three million, one hundred twenty-five thousand, three hundred ninety-one".