125165857 has 4 divisors (see below), whose sum is σ = 128548756. Its totient is φ = 121782960.

The previous prime is 125165837. The next prime is 125165867. The reversal of 125165857 is 758561521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758561521 = 373 ⋅2033677.

It can be written as a sum of positive squares in 2 ways, for example, as 52983841 + 72182016 = 7279^2 + 8496^2 .

It is a cyclic number.

It is not a de Polignac number, because 125165857 - 2¹⁵ = 125133089 is a prime.

It is a super-3 number, since 3×125165857³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125165837) 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, 1691394 + ... + 1691467.

It is an arithmetic number, because the mean of its divisors is an integer number (32137189).

Almost surely, 2^125165857 is an apocalyptic number.

It is an amenable number.

125165857 is a deficient number, since it is larger than the sum of its proper divisors (3382899).

125165857 is an equidigital number, since it uses as much as digits as its factorization.

125165857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3382898.

The product of its digits is 84000, while the sum is 40.

The square root of 125165857 is about 11187.7547792218. The cubic root of 125165857 is about 500.2210449305.

The spelling of 125165857 in words is "one hundred twenty-five million, one hundred sixty-five thousand, eight hundred fifty-seven".