125726991 has 8 divisors (see below), whose sum is σ = 180531120. Its totient is φ = 77370432.

The previous prime is 125726959. The next prime is 125727011. The reversal of 125726991 is 199627521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 125726991 - 2⁵ = 125726959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125726911) 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 7 ways as a sum of consecutive naturals, for example, 1611846 + ... + 1611923.

It is an arithmetic number, because the mean of its divisors is an integer number (22566390).

Almost surely, 2^125726991 is an apocalyptic number.

125726991 is a deficient number, since it is larger than the sum of its proper divisors (54804129).

125726991 is a wasteful number, since it uses less digits than its factorization.

125726991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223785.

The product of its digits is 68040, while the sum is 42.

The square root of 125726991 is about 11212.8047784664. The cubic root of 125726991 is about 500.9674482139.

The spelling of 125726991 in words is "one hundred twenty-five million, seven hundred twenty-six thousand, nine hundred ninety-one".