125949521 has 4 divisors (see below), whose sum is σ = 125972544. Its totient is φ = 125926500.

The previous prime is 125949503. The next prime is 125949529.

125949521 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125949521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125949529) 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, 1916 + ... + 15986.

It is an arithmetic number, because the mean of its divisors is an integer number (31493136).

Almost surely, 2^125949521 is an apocalyptic number.

It is an amenable number.

125949521 is a deficient number, since it is larger than the sum of its proper divisors (23023).

125949521 is an equidigital number, since it uses as much as digits as its factorization.

125949521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23022.

The product of its digits is 32400, while the sum is 38.

The square root of 125949521 is about 11222.7234217012. The cubic root of 125949521 is about 501.2628358062.

The spelling of 125949521 in words is "one hundred twenty-five million, nine hundred forty-nine thousand, five hundred twenty-one".