1012543251101 has 4 divisors (see below), whose sum is σ = 1012556499612. Its totient is φ = 1012530002592.

The previous prime is 1012543251047. The next prime is 1012543251113. The reversal of 1012543251101 is 1011523452101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 965160845476 + 47382405625 = 982426^2 + 217675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012543251101 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 (1012543251001) 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, 6508946 + ... + 6662691.

It is an arithmetic number, because the mean of its divisors is an integer number (253139124903).

Almost surely, 2^{1012543251101} is an apocalyptic number.

It is an amenable number.

1012543251101 is a deficient number, since it is larger than the sum of its proper divisors (13248511).

1012543251101 is an equidigital number, since it uses as much as digits as its factorization.

1012543251101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248510.

The product of its (nonzero) digits is 1200, while the sum is 26.

The spelling of 1012543251101 in words is "one trillion, twelve billion, five hundred forty-three million, two hundred fifty-one thousand, one hundred one".