125725791 has 4 divisors (see below), whose sum is σ = 167634392. Its totient is φ = 83817192.

The previous prime is 125725781. The next prime is 125725807. The reversal of 125725791 is 197527521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197527521 = 3 ⋅65842507.

It is not a de Polignac number, because 125725791 - 2⁹ = 125725279 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 (125725781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20954296 + ... + 20954301.

It is an arithmetic number, because the mean of its divisors is an integer number (41908598).

Almost surely, 2^125725791 is an apocalyptic number.

125725791 is a deficient number, since it is larger than the sum of its proper divisors (41908601).

125725791 is an equidigital number, since it uses as much as digits as its factorization.

125725791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41908600.

The product of its digits is 44100, while the sum is 39.

The square root of 125725791 is about 11212.7512680876. The cubic root of 125725791 is about 500.9658543826.

The spelling of 125725791 in words is "one hundred twenty-five million, seven hundred twenty-five thousand, seven hundred ninety-one".