243145031 has 2 divisors, whose sum is σ = 243145032. Its totient is φ = 243145030.

The previous prime is 243145027. The next prime is 243145037. The reversal of 243145031 is 130541342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243145031 - 2² = 243145027 is a prime.

It is a super-2 number, since 2×243145031² = 118239012199981922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243144988 and 243145006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243145037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121572515 + 121572516.

It is an arithmetic number, because the mean of its divisors is an integer number (121572516).

Almost surely, 2^243145031 is an apocalyptic number.

243145031 is a deficient number, since it is larger than the sum of its proper divisors (1).

243145031 is an equidigital number, since it uses as much as digits as its factorization.

243145031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 243145031 is about 15593.1084457205. The cubic root of 243145031 is about 624.1492689895.

Adding to 243145031 its reverse (130541342), we get a palindrome (373686373).

The spelling of 243145031 in words is "two hundred forty-three million, one hundred forty-five thousand, thirty-one".