120857563 has 4 divisors (see below), whose sum is σ = 123668248. Its totient is φ = 118046880.

The previous prime is 120857557. The next prime is 120857567. The reversal of 120857563 is 365758021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365758021 = 1607 ⋅227603.

It is a cyclic number.

It is not a de Polignac number, because 120857563 - 2²⁵ = 87303131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120857567) 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, 1405278 + ... + 1405363.

It is an arithmetic number, because the mean of its divisors is an integer number (30917062).

Almost surely, 2^120857563 is an apocalyptic number.

120857563 is a deficient number, since it is larger than the sum of its proper divisors (2810685).

120857563 is an equidigital number, since it uses as much as digits as its factorization.

120857563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810684.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 120857563 is about 10993.5236844244. The cubic root of 120857563 is about 494.4145893722.

The spelling of 120857563 in words is "one hundred twenty million, eight hundred fifty-seven thousand, five hundred sixty-three".