2520120561 has 16 divisors (see below), whose sum is σ = 3972604800. Its totient is φ = 1390411008.

The previous prime is 2520120539. The next prime is 2520120569. The reversal of 2520120561 is 1650210252.

It is a happy number.

It is not a de Polignac number, because 2520120561 - 2¹⁵ = 2520087793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2520120569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2068456 + ... + 2069673.

It is an arithmetic number, because the mean of its divisors is an integer number (248287800).

Almost surely, 2^2520120561 is an apocalyptic number.

2520120561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2520120561 is a deficient number, since it is larger than the sum of its proper divisors (1452484239).

2520120561 is a wasteful number, since it uses less digits than its factorization.

2520120561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138168.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2520120561 is about 50200.8023939857. The cubic root of 2520120561 is about 1360.8401241184.

The spelling of 2520120561 in words is "two billion, five hundred twenty million, one hundred twenty thousand, five hundred sixty-one".