561170989821 has 16 divisors (see below), whose sum is σ = 811120311680. Its totient is φ = 343048996800.

The previous prime is 561170989793. The next prime is 561170989849. The reversal of 561170989821 is 128989071165.

It is an interprime number because it is at equal distance from previous prime (561170989793) and next prime (561170989849).

It is not a de Polignac number, because 561170989821 - 2¹⁷ = 561170858749 is a prime.

It is a super-2 number, since 2×561170989821² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561170989121) 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, 47639806 + ... + 47651583.

It is an arithmetic number, because the mean of its divisors is an integer number (50695019480).

Almost surely, 2^561170989821 is an apocalyptic number.

It is an amenable number.

561170989821 is a deficient number, since it is larger than the sum of its proper divisors (249949321859).

561170989821 is a wasteful number, since it uses less digits than its factorization.

561170989821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95291556.

The product of its (nonzero) digits is 2177280, while the sum is 57.

The spelling of 561170989821 in words is "five hundred sixty-one billion, one hundred seventy million, nine hundred eighty-nine thousand, eight hundred twenty-one".