125811013 has 4 divisors (see below), whose sum is σ = 125852428. Its totient is φ = 125769600.

The previous prime is 125811011. The next prime is 125811041. The reversal of 125811013 is 310118521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310118521 = 337 ⋅920233.

It can be written as a sum of positive squares in 2 ways, for example, as 47983329 + 77827684 = 6927^2 + 8822^2 .

It is a cyclic number.

It is not a de Polignac number, because 125811013 - 2¹ = 125811011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125811011) 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, 15756 + ... + 22357.

It is an arithmetic number, because the mean of its divisors is an integer number (31463107).

Almost surely, 2^125811013 is an apocalyptic number.

It is an amenable number.

125811013 is a deficient number, since it is larger than the sum of its proper divisors (41415).

125811013 is an equidigital number, since it uses as much as digits as its factorization.

125811013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41414.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 125811013 is about 11216.5508513090. The cubic root of 125811013 is about 501.0790204215.

Adding to 125811013 its reverse (310118521), we get a palindrome (435929534).

The spelling of 125811013 in words is "one hundred twenty-five million, eight hundred eleven thousand, thirteen".