125131203121 has 2 divisors, whose sum is σ = 125131203122. Its totient is φ = 125131203120.

The previous prime is 125131203089. The next prime is 125131203157. The reversal of 125131203121 is 121302131521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122318067600 + 2813135521 = 349740^2 + 53039^2 .

It is an emirp because it is prime and its reverse (121302131521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125131203121 - 2⁵ = 125131203089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125131203092 and 125131203101.

It is not a weakly prime, because it can be changed into another prime (125131209121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62565601560 + 62565601561.

It is an arithmetic number, because the mean of its divisors is an integer number (62565601561).

Almost surely, 2^125131203121 is an apocalyptic number.

It is an amenable number.

125131203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125131203121 is an equidigital number, since it uses as much as digits as its factorization.

125131203121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 125131203121 its reverse (121302131521), we get a palindrome (246433334642).

The spelling of 125131203121 in words is "one hundred twenty-five billion, one hundred thirty-one million, two hundred three thousand, one hundred twenty-one".