125521611 has 4 divisors (see below), whose sum is σ = 167362152. Its totient is φ = 83681072.

The previous prime is 125521609. The next prime is 125521637. The reversal of 125521611 is 116125521.

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 125521611 - 2¹ = 125521609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125521411) 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, 20920266 + ... + 20920271.

It is an arithmetic number, because the mean of its divisors is an integer number (41840538).

Almost surely, 2^125521611 is an apocalyptic number.

125521611 is a deficient number, since it is larger than the sum of its proper divisors (41840541).

125521611 is an equidigital number, since it uses as much as digits as its factorization.

125521611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41840540.

The product of its digits is 600, while the sum is 24.

The square root of 125521611 is about 11203.6427558183. The cubic root of 125521611 is about 500.6945161812.

The spelling of 125521611 in words is "one hundred twenty-five million, five hundred twenty-one thousand, six hundred eleven".