125040815 has 4 divisors (see below), whose sum is σ = 150048984. Its totient is φ = 100032648.

The previous prime is 125040803. The next prime is 125040829. The reversal of 125040815 is 518040521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518040521 = 1129 ⋅458849.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125040815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12504077 + ... + 12504086.

It is an arithmetic number, because the mean of its divisors is an integer number (37512246).

Almost surely, 2^125040815 is an apocalyptic number.

125040815 is a deficient number, since it is larger than the sum of its proper divisors (25008169).

125040815 is an equidigital number, since it uses as much as digits as its factorization.

125040815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25008168.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 125040815 is about 11182.1650408139. The cubic root of 125040815 is about 500.0544140780.

The spelling of 125040815 in words is "one hundred twenty-five million, forty thousand, eight hundred fifteen".