125121599 has 2 divisors, whose sum is σ = 125121600. Its totient is φ = 125121598.

The previous prime is 125121569. The next prime is 125121643. The reversal of 125121599 is 995121521.

It is a weak prime.

It is an emirp because it is prime and its reverse (995121521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125121599 is a prime.

It is a Sophie Germain 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 (125121559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62560799 + 62560800.

It is an arithmetic number, because the mean of its divisors is an integer number (62560800).

Almost surely, 2^125121599 is an apocalyptic number.

125121599 is a deficient number, since it is larger than the sum of its proper divisors (1).

125121599 is an equidigital number, since it uses as much as digits as its factorization.

125121599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 35.

The square root of 125121599 is about 11185.7766382134. The cubic root of 125121599 is about 500.1620794548.

The spelling of 125121599 in words is "one hundred twenty-five million, one hundred twenty-one thousand, five hundred ninety-nine".