125506505 has 4 divisors (see below), whose sum is σ = 150607812. Its totient is φ = 100405200.

The previous prime is 125506481. The next prime is 125506543. The reversal of 125506505 is 505605521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505605521 = 1013 ⋅499117.

It can be written as a sum of positive squares in 2 ways, for example, as 32171584 + 93334921 = 5672^2 + 9661^2 .

It is not a de Polignac number, because 125506505 - 2⁶ = 125506441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12550646 + ... + 12550655.

It is an arithmetic number, because the mean of its divisors is an integer number (37651953).

Almost surely, 2^125506505 is an apocalyptic number.

It is an amenable number.

125506505 is a deficient number, since it is larger than the sum of its proper divisors (25101307).

125506505 is an equidigital number, since it uses as much as digits as its factorization.

125506505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25101306.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 125506505 is about 11202.9685798006. The cubic root of 125506505 is about 500.6744298797.

The spelling of 125506505 in words is "one hundred twenty-five million, five hundred six thousand, five hundred five".