125681915 has 4 divisors (see below), whose sum is σ = 150818304. Its totient is φ = 100545528.

The previous prime is 125681909. The next prime is 125681917. The reversal of 125681915 is 519186521.

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

It is a cyclic number.

It is not a de Polignac number, because 125681915 - 2¹⁴ = 125665531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125681917) 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, 12568187 + ... + 12568196.

It is an arithmetic number, because the mean of its divisors is an integer number (37704576).

Almost surely, 2^125681915 is an apocalyptic number.

125681915 is a deficient number, since it is larger than the sum of its proper divisors (25136389).

125681915 is an equidigital number, since it uses as much as digits as its factorization.

125681915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25136388.

The product of its digits is 21600, while the sum is 38.

The square root of 125681915 is about 11210.7945748729. The cubic root of 125681915 is about 500.9075716307.

The spelling of 125681915 in words is "one hundred twenty-five million, six hundred eighty-one thousand, nine hundred fifteen".