13125442243541 has 4 divisors (see below), whose sum is σ = 13125473139084. Its totient is φ = 13125411348000.

The previous prime is 13125442243523. The next prime is 13125442243577. The reversal of 13125442243541 is 14534224452131.

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 6141425676100 + 6984016567441 = 2478190^2 + 2642729^2 .

It is a cyclic number.

It is not a de Polignac number, because 13125442243541 - 2²² = 13125438049237 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 (13125442243741) 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, 14801510 + ... + 15663191.

It is an arithmetic number, because the mean of its divisors is an integer number (3281368284771).

Almost surely, 2^{13125442243541} is an apocalyptic number.

It is an amenable number.

13125442243541 is a deficient number, since it is larger than the sum of its proper divisors (30895543).

13125442243541 is an equidigital number, since it uses as much as digits as its factorization.

13125442243541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30895542.

The product of its digits is 460800, while the sum is 41.

Adding to 13125442243541 its reverse (14534224452131), we get a palindrome (27659666695672).

The spelling of 13125442243541 in words is "thirteen trillion, one hundred twenty-five billion, four hundred forty-two million, two hundred forty-three thousand, five hundred forty-one".