125520811 has 4 divisors (see below), whose sum is σ = 135176272. Its totient is φ = 115865352.

The previous prime is 125520797. The next prime is 125520839. The reversal of 125520811 is 118025521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125520811 - 2¹³ = 125512619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125520851) 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, 4827711 + ... + 4827736.

It is an arithmetic number, because the mean of its divisors is an integer number (33794068).

Almost surely, 2^125520811 is an apocalyptic number.

125520811 is a deficient number, since it is larger than the sum of its proper divisors (9655461).

125520811 is an equidigital number, since it uses as much as digits as its factorization.

125520811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9655460.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 125520811 is about 11203.6070530879. The cubic root of 125520811 is about 500.6934524694.

The spelling of 125520811 in words is "one hundred twenty-five million, five hundred twenty thousand, eight hundred eleven".