125798721 has 4 divisors (see below), whose sum is σ = 167731632. Its totient is φ = 83865812.

The previous prime is 125798689. The next prime is 125798749. The reversal of 125798721 is 127897521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127897521 = 3 ⋅42632507.

It is a cyclic number.

It is not a de Polignac number, because 125798721 - 2⁵ = 125798689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125798921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20966451 + ... + 20966456.

It is an arithmetic number, because the mean of its divisors is an integer number (41932908).

Almost surely, 2^125798721 is an apocalyptic number.

It is an amenable number.

125798721 is a deficient number, since it is larger than the sum of its proper divisors (41932911).

125798721 is an equidigital number, since it uses as much as digits as its factorization.

125798721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41932910.

The product of its digits is 70560, while the sum is 42.

The square root of 125798721 is about 11216.0028976458. The cubic root of 125798721 is about 501.0627010660.

The spelling of 125798721 in words is "one hundred twenty-five million, seven hundred ninety-eight thousand, seven hundred twenty-one".