125440455121 has 2 divisors, whose sum is σ = 125440455122. Its totient is φ = 125440455120.

The previous prime is 125440455103. The next prime is 125440455137. The reversal of 125440455121 is 121554044521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98445965121 + 26994490000 = 313761^2 + 164300^2 .

It is a cyclic number.

It is not a de Polignac number, because 125440455121 - 2¹⁵ = 125440422353 is a prime.

It is not a weakly prime, because it can be changed into another prime (125440455421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62720227560 + 62720227561.

It is an arithmetic number, because the mean of its divisors is an integer number (62720227561).

Almost surely, 2^125440455121 is an apocalyptic number.

It is an amenable number.

125440455121 is a deficient number, since it is larger than the sum of its proper divisors (1).

125440455121 is an equidigital number, since it uses as much as digits as its factorization.

125440455121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 125440455121 its reverse (121554044521), we get a palindrome (246994499642).

The spelling of 125440455121 in words is "one hundred twenty-five billion, four hundred forty million, four hundred fifty-five thousand, one hundred twenty-one".