125871511 has 4 divisors (see below), whose sum is σ = 125902224. Its totient is φ = 125840800.

The previous prime is 125871497. The next prime is 125871527. The reversal of 125871511 is 115178521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115178521 = 37 ⋅3112933.

It is a cyclic number.

It is not a de Polignac number, because 125871511 - 2¹¹ = 125869463 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 (125871541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8050 + ... + 17791.

It is an arithmetic number, because the mean of its divisors is an integer number (31475556).

Almost surely, 2^125871511 is an apocalyptic number.

125871511 is a deficient number, since it is larger than the sum of its proper divisors (30713).

125871511 is an equidigital number, since it uses as much as digits as its factorization.

125871511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30712.

The product of its digits is 2800, while the sum is 31.

The square root of 125871511 is about 11219.2473455219. The cubic root of 125871511 is about 501.1593245224.

The spelling of 125871511 in words is "one hundred twenty-five million, eight hundred seventy-one thousand, five hundred eleven".