125887813 has 2 divisors, whose sum is σ = 125887814. Its totient is φ = 125887812.

The previous prime is 125887777. The next prime is 125887819. The reversal of 125887813 is 318788521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124032769 + 1855044 = 11137^2 + 1362^2 .

It is an emirp because it is prime and its reverse (318788521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125887813 - 2²¹ = 123790661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125887813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125887819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62943906 + 62943907.

It is an arithmetic number, because the mean of its divisors is an integer number (62943907).

Almost surely, 2^125887813 is an apocalyptic number.

It is an amenable number.

125887813 is a deficient number, since it is larger than the sum of its proper divisors (1).

125887813 is an equidigital number, since it uses as much as digits as its factorization.

125887813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 43.

The square root of 125887813 is about 11219.9738413242. The cubic root of 125887813 is about 501.1809591416.

The spelling of 125887813 in words is "one hundred twenty-five million, eight hundred eighty-seven thousand, eight hundred thirteen".