125405523 has 16 divisors (see below), whose sum is σ = 186458400. Its totient is φ = 83301120.

The previous prime is 125405519. The next prime is 125405537. The reversal of 125405523 is 325504521.

It is a happy number.

It is not a de Polignac number, because 125405523 - 2² = 125405519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (125405513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 678 + ... + 15851.

It is an arithmetic number, because the mean of its divisors is an integer number (11653650).

Almost surely, 2^125405523 is an apocalyptic number.

125405523 is a deficient number, since it is larger than the sum of its proper divisors (61052877).

125405523 is a wasteful number, since it uses less digits than its factorization.

125405523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16819 (or 16813 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 125405523 is about 11198.4607424413. The cubic root of 125405523 is about 500.5401136777.

The spelling of 125405523 in words is "one hundred twenty-five million, four hundred five thousand, five hundred twenty-three".