125555589 has 10 divisors (see below), whose sum is σ = 187558470. Its totient is φ = 83703672.

The previous prime is 125555567. The next prime is 125555603. The reversal of 125555589 is 985555521.

125555589 is a `hidden beast` number, since 12 + 5 + 5 + 55 + 589 = 666.

It can be written as a sum of positive squares in only one way, i.e., 104898564 + 20657025 = 10242^2 + 4545^2 .

It is not a de Polignac number, because 125555589 - 2⁷ = 125555461 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125555519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 774954 + ... + 775115.

It is an arithmetic number, because the mean of its divisors is an integer number (18755847).

Almost surely, 2^125555589 is an apocalyptic number.

It is an amenable number.

125555589 is a deficient number, since it is larger than the sum of its proper divisors (62002881).

125555589 is an equidigital number, since it uses as much as digits as its factorization.

125555589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550081 (or 1550072 counting only the distinct ones).

The product of its digits is 450000, while the sum is 45.

The square root of 125555589 is about 11205.1590350160. The cubic root of 125555589 is about 500.7396905096.

The spelling of 125555589 in words is "one hundred twenty-five million, five hundred fifty-five thousand, five hundred eighty-nine".