125641391 has 4 divisors (see below), whose sum is σ = 125663832. Its totient is φ = 125618952.

The previous prime is 125641367. The next prime is 125641403. The reversal of 125641391 is 193146521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125641391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125641301) 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, 4865 + ... + 16581.

It is an arithmetic number, because the mean of its divisors is an integer number (31415958).

Almost surely, 2^125641391 is an apocalyptic number.

125641391 is a deficient number, since it is larger than the sum of its proper divisors (22441).

125641391 is a wasteful number, since it uses less digits than its factorization.

125641391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22440.

The product of its digits is 6480, while the sum is 32.

The square root of 125641391 is about 11208.9870639590. The cubic root of 125641391 is about 500.8537294624.

The spelling of 125641391 in words is "one hundred twenty-five million, six hundred forty-one thousand, three hundred ninety-one".