125125643 has 4 divisors (see below), whose sum is σ = 126888048. Its totient is φ = 123363240.

The previous prime is 125125639. The next prime is 125125733. The reversal of 125125643 is 346521521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346521521 = 67 ⋅5171963.

It is a cyclic number.

It is not a de Polignac number, because 125125643 - 2² = 125125639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125125243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 881096 + ... + 881237.

It is an arithmetic number, because the mean of its divisors is an integer number (31722012).

Almost surely, 2^125125643 is an apocalyptic number.

125125643 is a deficient number, since it is larger than the sum of its proper divisors (1762405).

125125643 is an equidigital number, since it uses as much as digits as its factorization.

125125643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762404.

The product of its digits is 7200, while the sum is 29.

The square root of 125125643 is about 11185.9574020287. The cubic root of 125125643 is about 500.1674679027.

The spelling of 125125643 in words is "one hundred twenty-five million, one hundred twenty-five thousand, six hundred forty-three".