123531543011257 has 2 divisors, whose sum is σ = 123531543011258. Its totient is φ = 123531543011256.

The previous prime is 123531543011141. The next prime is 123531543011263. The reversal of 123531543011257 is 752110345135321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123319159367056 + 212383644201 = 11104916^2 + 460851^2 .

It is a cyclic number.

It is not a de Polignac number, because 123531543011257 - 2¹⁹ = 123531542486969 is a prime.

It is not a weakly prime, because it can be changed into another prime (123531543071257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61765771505628 + 61765771505629.

It is an arithmetic number, because the mean of its divisors is an integer number (61765771505629).

Almost surely, 2^{123531543011257} is an apocalyptic number.

It is an amenable number.

123531543011257 is a deficient number, since it is larger than the sum of its proper divisors (1).

123531543011257 is an equidigital number, since it uses as much as digits as its factorization.

123531543011257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 43.

Adding to 123531543011257 its reverse (752110345135321), we get a palindrome (875641888146578).

The spelling of 123531543011257 in words is "one hundred twenty-three trillion, five hundred thirty-one billion, five hundred forty-three million, eleven thousand, two hundred fifty-seven".