125525511 has 16 divisors (see below), whose sum is σ = 188056800. Its totient is φ = 82741824.

The previous prime is 125525489. The next prime is 125525531. The reversal of 125525511 is 115525521.

125525511 is a `hidden beast` number, since 125 + 5 + 25 + 511 = 666.

It is not a de Polignac number, because 125525511 - 2⁶ = 125525447 is a prime.

It is a super-2 number, since 2×125525511² = 31513307823622242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125525531) 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 in 15 ways as a sum of consecutive naturals, for example, 23716 + ... + 28521.

It is an arithmetic number, because the mean of its divisors is an integer number (11753550).

Almost surely, 2^125525511 is an apocalyptic number.

125525511 is a deficient number, since it is larger than the sum of its proper divisors (62531289).

125525511 is an equidigital number, since it uses as much as digits as its factorization.

125525511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52335 (or 52329 counting only the distinct ones).

The product of its digits is 2500, while the sum is 27.

The square root of 125525511 is about 11203.8168050000. The cubic root of 125525511 is about 500.6997017116.

The spelling of 125525511 in words is "one hundred twenty-five million, five hundred twenty-five thousand, five hundred eleven".