125807813 has 2 divisors, whose sum is σ = 125807814. Its totient is φ = 125807812.

The previous prime is 125807789. The next prime is 125807821. The reversal of 125807813 is 318708521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102556129 + 23251684 = 10127^2 + 4822^2 .

It is a cyclic number.

It is not a de Polignac number, because 125807813 - 2¹⁴ = 125791429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125807833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62903906 + 62903907.

It is an arithmetic number, because the mean of its divisors is an integer number (62903907).

Almost surely, 2^125807813 is an apocalyptic number.

It is an amenable number.

125807813 is a deficient number, since it is larger than the sum of its proper divisors (1).

125807813 is an equidigital number, since it uses as much as digits as its factorization.

125807813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 125807813 is about 11216.4082040553. The cubic root of 125807813 is about 501.0747720746.

The spelling of 125807813 in words is "one hundred twenty-five million, eight hundred seven thousand, eight hundred thirteen".