243132251 has 2 divisors, whose sum is σ = 243132252. Its totient is φ = 243132250.

The previous prime is 243132233. The next prime is 243132311. The reversal of 243132251 is 152231342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243132251 - 2¹⁰ = 243131227 is a prime.

It is a super-2 number, since 2×243132251² = 118226582952654002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243132751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121566125 + 121566126.

It is an arithmetic number, because the mean of its divisors is an integer number (121566126).

Almost surely, 2^243132251 is an apocalyptic number.

243132251 is a deficient number, since it is larger than the sum of its proper divisors (1).

243132251 is an equidigital number, since it uses as much as digits as its factorization.

243132251 is an evil number, because the sum of its binary digits is even.

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

The square root of 243132251 is about 15592.6986439166. The cubic root of 243132251 is about 624.1383334485.

Adding to 243132251 its reverse (152231342), we get a palindrome (395363593).

Subtracting from 243132251 its reverse (152231342), we obtain a palindrome (90900909).

The spelling of 243132251 in words is "two hundred forty-three million, one hundred thirty-two thousand, two hundred fifty-one".