125850913091 has 4 divisors (see below), whose sum is σ = 125852323632. Its totient is φ = 125849502552.

The previous prime is 125850913049. The next prime is 125850913099. The reversal of 125850913091 is 190319058521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190319058521 = 67 ⋅2840582963.

It is a cyclic number.

It is not a de Polignac number, because 125850913091 - 2²⁶ = 125783804227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125850913099) 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 3 ways as a sum of consecutive naturals, for example, 561695 + ... + 753128.

It is an arithmetic number, because the mean of its divisors is an integer number (31463080908).

Almost surely, 2^125850913091 is an apocalyptic number.

125850913091 is a deficient number, since it is larger than the sum of its proper divisors (1410541).

125850913091 is an equidigital number, since it uses as much as digits as its factorization.

125850913091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410540.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 125850913091 in words is "one hundred twenty-five billion, eight hundred fifty million, nine hundred thirteen thousand, ninety-one".