125121618 has 16 divisors (see below), whose sum is σ = 278048160. Its totient is φ = 41707188.

The previous prime is 125121599. The next prime is 125121643. The reversal of 125121618 is 816121521.

125121618 is a `hidden beast` number, since 1 + 25 + 1 + 21 + 618 = 666.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 125121591 and 125121600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158480 + ... + 1158587.

It is an arithmetic number, because the mean of its divisors is an integer number (17378010).

Almost surely, 2^125121618 is an apocalyptic number.

125121618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

125121618 is an abundant number, since it is smaller than the sum of its proper divisors (152926542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125121618 is a wasteful number, since it uses less digits than its factorization.

125121618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317078 (or 2317072 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 125121618 is about 11185.7774875062. Note that the first 3 decimals coincide. The cubic root of 125121618 is about 500.1621047717.

The spelling of 125121618 in words is "one hundred twenty-five million, one hundred twenty-one thousand, six hundred eighteen".