125105021161 has 4 divisors (see below), whose sum is σ = 125105745024. Its totient is φ = 125104297300.

The previous prime is 125105021131. The next prime is 125105021179. The reversal of 125105021161 is 161120501521.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 125105021161 - 2⁷ = 125105021033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125105021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65856 + ... + 504526.

It is an arithmetic number, because the mean of its divisors is an integer number (31276436256).

Almost surely, 2^125105021161 is an apocalyptic number.

It is an amenable number.

125105021161 is a deficient number, since it is larger than the sum of its proper divisors (723863).

125105021161 is an equidigital number, since it uses as much as digits as its factorization.

125105021161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723862.

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 125105021161 its reverse (161120501521), we get a palindrome (286225522682).

The spelling of 125105021161 in words is "one hundred twenty-five billion, one hundred five million, twenty-one thousand, one hundred sixty-one".