1125748343821 has 6 divisors (see below), whose sum is σ = 1195864157930. Its totient is φ = 1059527852736.

The previous prime is 1125748343801. The next prime is 1125748343873. The reversal of 1125748343821 is 1283438475211.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 138882928900 + 986865414921 = 372670^2 + 993411^2 .

It is not a de Polignac number, because 1125748343821 - 2¹⁵ = 1125748311053 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 (1125748343801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1947661206 + ... + 1947661783.

Almost surely, 2^{1125748343821} is an apocalyptic number.

It is an amenable number.

1125748343821 is a deficient number, since it is larger than the sum of its proper divisors (70115814109).

1125748343821 is an equidigital number, since it uses as much as digits as its factorization.

1125748343821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895323023 (or 3895323006 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 49.

The spelling of 1125748343821 in words is "one trillion, one hundred twenty-five billion, seven hundred forty-eight million, three hundred forty-three thousand, eight hundred twenty-one".