125128605 has 24 divisors (see below), whose sum is σ = 232893792. Its totient is φ = 57201312.

The previous prime is 125128603. The next prime is 125128607. The reversal of 125128605 is 506821521.

It is an interprime number because it is at equal distance from previous prime (125128603) and next prime (125128607).

It is not a de Polignac number, because 125128605 - 2¹ = 125128603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125128603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84387 + ... + 85856.

It is an arithmetic number, because the mean of its divisors is an integer number (9703908).

Almost surely, 2^125128605 is an apocalyptic number.

125128605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

125128605 is a deficient number, since it is larger than the sum of its proper divisors (107765187).

125128605 is a wasteful number, since it uses less digits than its factorization.

125128605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170265 (or 170258 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 125128605 is about 11186.0897993892. The cubic root of 125128605 is about 500.1714145607.

The spelling of 125128605 in words is "one hundred twenty-five million, one hundred twenty-eight thousand, six hundred five".