561117851 has 4 divisors (see below), whose sum is σ = 641277552. Its totient is φ = 480958152.

The previous prime is 561117811. The next prime is 561117859. The reversal of 561117851 is 158711165.

It is a happy number.

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 561117851 - 2⁶ = 561117787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561117859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40079840 + ... + 40079853.

It is an arithmetic number, because the mean of its divisors is an integer number (160319388).

Almost surely, 2^561117851 is an apocalyptic number.

561117851 is a deficient number, since it is larger than the sum of its proper divisors (80159701).

561117851 is an equidigital number, since it uses as much as digits as its factorization.

561117851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80159700.

The product of its digits is 8400, while the sum is 35.

The square root of 561117851 is about 23687.9262705708. The cubic root of 561117851 is about 824.8051457784.

The spelling of 561117851 in words is "five hundred sixty-one million, one hundred seventeen thousand, eight hundred fifty-one".