127212131161 has 4 divisors (see below), whose sum is σ = 127241225892. Its totient is φ = 127183036432.

The previous prime is 127212131149. The next prime is 127212131171. The reversal of 127212131161 is 161131212721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161131212721 = 24337 ⋅6620833.

It can be written as a sum of positive squares in 2 ways, for example, as 103076955136 + 24135176025 = 321056^2 + 155355^2 .

It is a cyclic number.

It is not a de Polignac number, because 127212131161 - 2¹¹ = 127212129113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127212131141) 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, 14540806 + ... + 14549551.

It is an arithmetic number, because the mean of its divisors is an integer number (31810306473).

Almost surely, 2^127212131161 is an apocalyptic number.

It is an amenable number.

127212131161 is a deficient number, since it is larger than the sum of its proper divisors (29094731).

127212131161 is an equidigital number, since it uses as much as digits as its factorization.

127212131161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29094730.

The product of its digits is 1008, while the sum is 28.

Adding to 127212131161 its reverse (161131212721), we get a palindrome (288343343882).

The spelling of 127212131161 in words is "one hundred twenty-seven billion, two hundred twelve million, one hundred thirty-one thousand, one hundred sixty-one".