120513561 has 64 divisors (see below), whose sum is σ = 207820800. Its totient is φ = 60466176.

The previous prime is 120513541. The next prime is 120513607. The reversal of 120513561 is 165315021.

It is not a de Polignac number, because 120513561 - 2⁵ = 120513529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120513511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 739266 + ... + 739428.

It is an arithmetic number, because the mean of its divisors is an integer number (3247200).

Almost surely, 2^120513561 is an apocalyptic number.

It is an amenable number.

120513561 is a deficient number, since it is larger than the sum of its proper divisors (87307239).

120513561 is a wasteful number, since it uses less digits than its factorization.

120513561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 120513561 is about 10977.8668692966. The cubic root of 120513561 is about 493.9450525410.

Adding to 120513561 its reverse (165315021), we get a palindrome (285828582).

The spelling of 120513561 in words is "one hundred twenty million, five hundred thirteen thousand, five hundred sixty-one".