1125042101 has 4 divisors (see below), whose sum is σ = 1126992492. Its totient is φ = 1123091712.

The previous prime is 1125042059. The next prime is 1125042103. The reversal of 1125042101 is 1012405211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1012405211 = 37 ⋅27362303.

It can be written as a sum of positive squares in 2 ways, for example, as 946792900 + 178249201 = 30770^2 + 13351^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125042101 - 2¹⁰ = 1125041077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1125042101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125042103) 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, 974330 + ... + 975483.

It is an arithmetic number, because the mean of its divisors is an integer number (281748123).

Almost surely, 2^1125042101 is an apocalyptic number.

It is an amenable number.

1125042101 is a deficient number, since it is larger than the sum of its proper divisors (1950391).

1125042101 is an equidigital number, since it uses as much as digits as its factorization.

1125042101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950390.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1125042101 is about 33541.6472612780. The cubic root of 1125042101 is about 1040.0548852321.

Adding to 1125042101 its reverse (1012405211), we get a palindrome (2137447312).

The spelling of 1125042101 in words is "one billion, one hundred twenty-five million, forty-two thousand, one hundred one".