125871851 has 4 divisors (see below), whose sum is σ = 143853552. Its totient is φ = 107890152.

The previous prime is 125871841. The next prime is 125871877. The reversal of 125871851 is 158178521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158178521 = 23 ⋅6877327.

It is a cyclic number.

It is not a de Polignac number, because 125871851 - 2⁶ = 125871787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125871841) 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, 8990840 + ... + 8990853.

It is an arithmetic number, because the mean of its divisors is an integer number (35963388).

Almost surely, 2^125871851 is an apocalyptic number.

125871851 is a deficient number, since it is larger than the sum of its proper divisors (17981701).

125871851 is an equidigital number, since it uses as much as digits as its factorization.

125871851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17981700.

The product of its digits is 22400, while the sum is 38.

The square root of 125871851 is about 11219.2624980433. The cubic root of 125871851 is about 501.1597757604.

The spelling of 125871851 in words is "one hundred twenty-five million, eight hundred seventy-one thousand, eight hundred fifty-one".