125851591 has 4 divisors (see below), whose sum is σ = 128921184. Its totient is φ = 122782000.

The previous prime is 125851559. The next prime is 125851613. The reversal of 125851591 is 195158521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125851591 - 2⁵ = 125851559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125851591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125851501) 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, 1534735 + ... + 1534816.

It is an arithmetic number, because the mean of its divisors is an integer number (32230296).

Almost surely, 2^125851591 is an apocalyptic number.

125851591 is a deficient number, since it is larger than the sum of its proper divisors (3069593).

125851591 is an equidigital number, since it uses as much as digits as its factorization.

125851591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069592.

The product of its digits is 18000, while the sum is 37.

The square root of 125851591 is about 11218.3595503086. The cubic root of 125851591 is about 501.1328858673.

The spelling of 125851591 in words is "one hundred twenty-five million, eight hundred fifty-one thousand, five hundred ninety-one".