125643647 has 2 divisors, whose sum is σ = 125643648. Its totient is φ = 125643646.

The previous prime is 125643613. The next prime is 125643649. The reversal of 125643647 is 746346521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125643647 - 2¹⁰ = 125642623 is a prime.

Together with 125643649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125643647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125643649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62821823 + 62821824.

It is an arithmetic number, because the mean of its divisors is an integer number (62821824).

Almost surely, 2^125643647 is an apocalyptic number.

125643647 is a deficient number, since it is larger than the sum of its proper divisors (1).

125643647 is an equidigital number, since it uses as much as digits as its factorization.

125643647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 125643647 is about 11209.0876970430. The cubic root of 125643647 is about 500.8567271986.

The spelling of 125643647 in words is "one hundred twenty-five million, six hundred forty-three thousand, six hundred forty-seven".