125143563121 has 2 divisors, whose sum is σ = 125143563122. Its totient is φ = 125143563120.

The previous prime is 125143563101. The next prime is 125143563191. The reversal of 125143563121 is 121365341521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100844988721 + 24298574400 = 317561^2 + 155880^2 .

It is a cyclic number.

It is not a de Polignac number, because 125143563121 - 2¹⁹ = 125143038833 is a prime.

It is a super-2 number, since 2×125143563121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125143563101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62571781560 + 62571781561.

It is an arithmetic number, because the mean of its divisors is an integer number (62571781561).

Almost surely, 2^125143563121 is an apocalyptic number.

It is an amenable number.

125143563121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125143563121 is an equidigital number, since it uses as much as digits as its factorization.

125143563121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The spelling of 125143563121 in words is "one hundred twenty-five billion, one hundred forty-three million, five hundred sixty-three thousand, one hundred twenty-one".