125245891 has 4 divisors (see below), whose sum is σ = 131837800. Its totient is φ = 118653984.

The previous prime is 125245843. The next prime is 125245909. The reversal of 125245891 is 198542521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198542521 = 2143 ⋅92647.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125245891 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 125245891.

It is not an unprimeable number, because it can be changed into a prime (125245831) 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, 3295926 + ... + 3295963.

It is an arithmetic number, because the mean of its divisors is an integer number (32959450).

Almost surely, 2^125245891 is an apocalyptic number.

125245891 is a deficient number, since it is larger than the sum of its proper divisors (6591909).

125245891 is an equidigital number, since it uses as much as digits as its factorization.

125245891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591908.

The product of its digits is 28800, while the sum is 37.

The square root of 125245891 is about 11191.3310647125. The cubic root of 125245891 is about 500.3276399239.

It can be divided in two parts, 125 and 245891, that added together give a square (246016 = 496²).

The spelling of 125245891 in words is "one hundred twenty-five million, two hundred forty-five thousand, eight hundred ninety-one".