143240257 has 2 divisors, whose sum is σ = 143240258. Its totient is φ = 143240256.

The previous prime is 143240231. The next prime is 143240281. The reversal of 143240257 is 752042341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132158016 + 11082241 = 11496^2 + 3329^2 .

It is a cyclic number.

It is not a de Polignac number, because 143240257 - 2⁷ = 143240129 is a prime.

It is not a weakly prime, because it can be changed into another prime (143240287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71620128 + 71620129.

It is an arithmetic number, because the mean of its divisors is an integer number (71620129).

Almost surely, 2^143240257 is an apocalyptic number.

It is an amenable number.

143240257 is a deficient number, since it is larger than the sum of its proper divisors (1).

143240257 is an equidigital number, since it uses as much as digits as its factorization.

143240257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 143240257 is about 11968.3021770007. The cubic root of 143240257 is about 523.2248520418.

Adding to 143240257 its reverse (752042341), we get a palindrome (895282598).

The spelling of 143240257 in words is "one hundred forty-three million, two hundred forty thousand, two hundred fifty-seven".