125815199 has 4 divisors (see below), whose sum is σ = 127947720. Its totient is φ = 123682680.

The previous prime is 125815189. The next prime is 125815219. The reversal of 125815199 is 991518521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125815199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125815139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066172 + ... + 1066289.

It is an arithmetic number, because the mean of its divisors is an integer number (31986930).

Almost surely, 2^125815199 is an apocalyptic number.

125815199 is a deficient number, since it is larger than the sum of its proper divisors (2132521).

125815199 is an equidigital number, since it uses as much as digits as its factorization.

125815199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132520.

The product of its digits is 32400, while the sum is 41.

The square root of 125815199 is about 11216.7374490090. The cubic root of 125815199 is about 501.0845776814.

The spelling of 125815199 in words is "one hundred twenty-five million, eight hundred fifteen thousand, one hundred ninety-nine".