561690399 has 8 divisors (see below), whose sum is σ = 749300992. Its totient is φ = 374270040.

The previous prime is 561690359. The next prime is 561690419. The reversal of 561690399 is 993096165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561690399 - 2¹⁶ = 561624863 is a prime.

It is a super-3 number, since 3×561690399³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561690359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40519 + ... + 52584.

It is an arithmetic number, because the mean of its divisors is an integer number (93662624).

Almost surely, 2^561690399 is an apocalyptic number.

561690399 is a deficient number, since it is larger than the sum of its proper divisors (187610593).

561690399 is a wasteful number, since it uses less digits than its factorization.

561690399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95117.

The product of its (nonzero) digits is 393660, while the sum is 48.

The square root of 561690399 is about 23700.0084177200. The cubic root of 561690399 is about 825.0855859786.

The spelling of 561690399 in words is "five hundred sixty-one million, six hundred ninety thousand, three hundred ninety-nine".