125640641 has 16 divisors (see below), whose sum is σ = 148189056. Its totient is φ = 104270976.

The previous prime is 125640631. The next prime is 125640679. The reversal of 125640641 is 146046521.

It is a cyclic number.

It is not a de Polignac number, because 125640641 - 2²⁶ = 58531777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125640631) 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 15 ways as a sum of consecutive naturals, for example, 57725 + ... + 59861.

It is an arithmetic number, because the mean of its divisors is an integer number (9261816).

Almost surely, 2^125640641 is an apocalyptic number.

It is an amenable number.

125640641 is a deficient number, since it is larger than the sum of its proper divisors (22548415).

125640641 is a wasteful number, since it uses less digits than its factorization.

125640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 125640641 is about 11208.9536086113. The cubic root of 125640641 is about 500.8527328666.

The spelling of 125640641 in words is "one hundred twenty-five million, six hundred forty thousand, six hundred forty-one".