125232109 has 4 divisors (see below), whose sum is σ = 125261404. Its totient is φ = 125202816.

The previous prime is 125232101. The next prime is 125232127. The reversal of 125232109 is 901232521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79602084 + 45630025 = 8922^2 + 6755^2 .

It is a cyclic number.

It is not a de Polignac number, because 125232109 - 2³ = 125232101 is a prime.

It is a super-2 number, since 2×125232109² = 31366162249175762, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125232101) by changing a digit.

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, 6852 + ... + 17245.

It is an arithmetic number, because the mean of its divisors is an integer number (31315351).

Almost surely, 2^125232109 is an apocalyptic number.

It is an amenable number.

125232109 is a deficient number, since it is larger than the sum of its proper divisors (29295).

125232109 is an equidigital number, since it uses as much as digits as its factorization.

125232109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29294.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 125232109 is about 11190.7153033218. The cubic root of 125232109 is about 500.3092873099.

The spelling of 125232109 in words is "one hundred twenty-five million, two hundred thirty-two thousand, one hundred nine".