125641643 has 4 divisors (see below), whose sum is σ = 126043368. Its totient is φ = 125239920.

The previous prime is 125641619. The next prime is 125641673. The reversal of 125641643 is 346146521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346146521 = 7 ⋅49449503.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125641643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125641673) 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 3 ways as a sum of consecutive naturals, for example, 200393 + ... + 201018.

It is an arithmetic number, because the mean of its divisors is an integer number (31510842).

Almost surely, 2^125641643 is an apocalyptic number.

125641643 is a deficient number, since it is larger than the sum of its proper divisors (401725).

125641643 is an equidigital number, since it uses as much as digits as its factorization.

125641643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401724.

The product of its digits is 17280, while the sum is 32.

The square root of 125641643 is about 11208.9983049334. The cubic root of 125641643 is about 500.8540643176.

The spelling of 125641643 in words is "one hundred twenty-five million, six hundred forty-one thousand, six hundred forty-three".