1243523010101 has 4 divisors (see below), whose sum is σ = 1308971589600. Its totient is φ = 1178074430604.

The previous prime is 1243523010083. The next prime is 1243523010167. The reversal of 1243523010101 is 1010103253421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243523010101 - 2³⁸ = 968645103157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243523010181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32724289721 + ... + 32724289758.

It is an arithmetic number, because the mean of its divisors is an integer number (327242897400).

Almost surely, 2^{1243523010101} is an apocalyptic number.

It is an amenable number.

1243523010101 is a deficient number, since it is larger than the sum of its proper divisors (65448579499).

1243523010101 is an equidigital number, since it uses as much as digits as its factorization.

1243523010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65448579498.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1243523010101 its reverse (1010103253421), we get a palindrome (2253626263522).

The spelling of 1243523010101 in words is "one trillion, two hundred forty-three billion, five hundred twenty-three million, ten thousand, one hundred one".