125431548509 has 2 divisors, whose sum is σ = 125431548510. Its totient is φ = 125431548508.

The previous prime is 125431548427. The next prime is 125431548521. The reversal of 125431548509 is 905845134521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94339279609 + 31092268900 = 307147^2 + 176330^2 .

It is a cyclic number.

It is not a de Polignac number, because 125431548509 - 2³² = 121136581213 is a prime.

It is a super-2 number, since 2×125431548509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125431508509) 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, 62715774254 + 62715774255.

It is an arithmetic number, because the mean of its divisors is an integer number (62715774255).

Almost surely, 2^125431548509 is an apocalyptic number.

It is an amenable number.

125431548509 is a deficient number, since it is larger than the sum of its proper divisors (1).

125431548509 is an equidigital number, since it uses as much as digits as its factorization.

125431548509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 125431548509 in words is "one hundred twenty-five billion, four hundred thirty-one million, five hundred forty-eight thousand, five hundred nine".