125522561 has 4 divisors (see below), whose sum is σ = 126048000. Its totient is φ = 124997124.

The previous prime is 125522549. The next prime is 125522563. The reversal of 125522561 is 165225521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165225521 = 199 ⋅830279.

It is a cyclic number.

It is not a de Polignac number, because 125522561 - 2¹⁴ = 125506177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125522563) 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, 262361 + ... + 262838.

It is an arithmetic number, because the mean of its divisors is an integer number (31512000).

Almost surely, 2^125522561 is an apocalyptic number.

It is an amenable number.

125522561 is a deficient number, since it is larger than the sum of its proper divisors (525439).

125522561 is an equidigital number, since it uses as much as digits as its factorization.

125522561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525438.

The product of its digits is 6000, while the sum is 29.

The square root of 125522561 is about 11203.6851526629. The cubic root of 125522561 is about 500.6957793331.

The spelling of 125522561 in words is "one hundred twenty-five million, five hundred twenty-two thousand, five hundred sixty-one".