125731799 has 2 divisors, whose sum is σ = 125731800. Its totient is φ = 125731798.

The previous prime is 125731747. The next prime is 125731861. The reversal of 125731799 is 997137521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125731799 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125731709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62865899 + 62865900.

It is an arithmetic number, because the mean of its divisors is an integer number (62865900).

Almost surely, 2^125731799 is an apocalyptic number.

125731799 is a deficient number, since it is larger than the sum of its proper divisors (1).

125731799 is an equidigital number, since it uses as much as digits as its factorization.

125731799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 44.

The square root of 125731799 is about 11213.0191741564. The cubic root of 125731799 is about 500.9738340631.

The spelling of 125731799 in words is "one hundred twenty-five million, seven hundred thirty-one thousand, seven hundred ninety-nine".