125493270781 has 2 divisors, whose sum is σ = 125493270782. Its totient is φ = 125493270780.

The previous prime is 125493270779. The next prime is 125493270797. The reversal of 125493270781 is 187072394521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81529665156 + 43963605625 = 285534^2 + 209675^2 .

It is a cyclic number.

It is not a de Polignac number, because 125493270781 - 2¹ = 125493270779 is a prime.

It is a super-2 number, since 2×125493270781² (a number of 23 digits) contains 22 as substring.

Together with 125493270779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125493270761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62746635390 + 62746635391.

It is an arithmetic number, because the mean of its divisors is an integer number (62746635391).

Almost surely, 2^125493270781 is an apocalyptic number.

It is an amenable number.

125493270781 is a deficient number, since it is larger than the sum of its proper divisors (1).

125493270781 is an equidigital number, since it uses as much as digits as its factorization.

125493270781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 125493270781 in words is "one hundred twenty-five billion, four hundred ninety-three million, two hundred seventy thousand, seven hundred eighty-one".