243148831 has 4 divisors (see below), whose sum is σ = 244053000. Its totient is φ = 242244664.

The previous prime is 243148823. The next prime is 243148837. The reversal of 243148831 is 138841342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138841342 = 2 ⋅69420671.

It is a cyclic number.

It is not a de Polignac number, because 243148831 - 2³ = 243148823 is a prime.

It is a super-2 number, since 2×243148831² = 118242708033333122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243148837) 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, 451681 + ... + 452218.

It is an arithmetic number, because the mean of its divisors is an integer number (61013250).

Almost surely, 2^243148831 is an apocalyptic number.

243148831 is a deficient number, since it is larger than the sum of its proper divisors (904169).

243148831 is an equidigital number, since it uses as much as digits as its factorization.

243148831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904168.

The product of its digits is 18432, while the sum is 34.

The square root of 243148831 is about 15593.2302939449. The cubic root of 243148831 is about 624.1525204850.

The spelling of 243148831 in words is "two hundred forty-three million, one hundred forty-eight thousand, eight hundred thirty-one".