125126277509 has 2 divisors, whose sum is σ = 125126277510. Its totient is φ = 125126277508.

The previous prime is 125126277499. The next prime is 125126277547. The reversal of 125126277509 is 905772621521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83396776225 + 41729501284 = 288785^2 + 204278^2 .

It is a cyclic number.

It is not a de Polignac number, because 125126277509 - 2⁸ = 125126277253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125126277599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62563138754 + 62563138755.

It is an arithmetic number, because the mean of its divisors is an integer number (62563138755).

Almost surely, 2^125126277509 is an apocalyptic number.

It is an amenable number.

125126277509 is a deficient number, since it is larger than the sum of its proper divisors (1).

125126277509 is an equidigital number, since it uses as much as digits as its factorization.

125126277509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 125126277509 in words is "one hundred twenty-five billion, one hundred twenty-six million, two hundred seventy-seven thousand, five hundred nine".