243034143557 has 2 divisors, whose sum is σ = 243034143558. Its totient is φ = 243034143556.

The previous prime is 243034143487. The next prime is 243034143563. The reversal of 243034143557 is 755341430342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235393810276 + 7640333281 = 485174^2 + 87409^2 .

It is a cyclic number.

It is not a de Polignac number, because 243034143557 - 2⁸ = 243034143301 is a prime.

It is a super-2 number, since 2×243034143557² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243034143577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121517071778 + 121517071779.

It is an arithmetic number, because the mean of its divisors is an integer number (121517071779).

Almost surely, 2^243034143557 is an apocalyptic number.

It is an amenable number.

243034143557 is a deficient number, since it is larger than the sum of its proper divisors (1).

243034143557 is an equidigital number, since it uses as much as digits as its factorization.

243034143557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 41.

Adding to 243034143557 its reverse (755341430342), we get a palindrome (998375573899).

The spelling of 243034143557 in words is "two hundred forty-three billion, thirty-four million, one hundred forty-three thousand, five hundred fifty-seven".