125006639 has 2 divisors, whose sum is σ = 125006640. Its totient is φ = 125006638.

The previous prime is 125006611. The next prime is 125006659. The reversal of 125006639 is 936600521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125006639 - 2¹² = 125002543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125006659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62503319 + 62503320.

It is an arithmetic number, because the mean of its divisors is an integer number (62503320).

Almost surely, 2^125006639 is an apocalyptic number.

125006639 is a deficient number, since it is larger than the sum of its proper divisors (1).

125006639 is an equidigital number, since it uses as much as digits as its factorization.

125006639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 125006639 is about 11180.6367886628. The cubic root of 125006639 is about 500.0088518433.

The spelling of 125006639 in words is "one hundred twenty-five million, six thousand, six hundred thirty-nine".