243132213257 has 2 divisors, whose sum is σ = 243132213258. Its totient is φ = 243132213256.

The previous prime is 243132213161. The next prime is 243132213271. The reversal of 243132213257 is 752312231342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230082349561 + 13049863696 = 479669^2 + 114236^2 .

It is a cyclic number.

It is not a de Polignac number, because 243132213257 - 2¹⁰ = 243132212233 is a prime.

It is a super-2 number, since 2×243132213257² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243132243257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121566106628 + 121566106629.

It is an arithmetic number, because the mean of its divisors is an integer number (121566106629).

Almost surely, 2^243132213257 is an apocalyptic number.

It is an amenable number.

243132213257 is a deficient number, since it is larger than the sum of its proper divisors (1).

243132213257 is an equidigital number, since it uses as much as digits as its factorization.

243132213257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

Adding to 243132213257 its reverse (752312231342), we get a palindrome (995444444599).

The spelling of 243132213257 in words is "two hundred forty-three billion, one hundred thirty-two million, two hundred thirteen thousand, two hundred fifty-seven".