561543331 has 16 divisors (see below), whose sum is σ = 593768448. Its totient is φ = 530359200.

The previous prime is 561543329. The next prime is 561543341. The reversal of 561543331 is 133345165.

It is a cyclic number.

It is not a de Polignac number, because 561543331 - 2¹ = 561543329 is a prime.

It is a super-2 number, since 2×561543331² = 630661825181151122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561543293 and 561543302.

It is not an unprimeable number, because it can be changed into a prime (561543341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225465 + ... + 227941.

It is an arithmetic number, because the mean of its divisors is an integer number (37110528).

Almost surely, 2^561543331 is an apocalyptic number.

561543331 is a deficient number, since it is larger than the sum of its proper divisors (32225117).

561543331 is a wasteful number, since it uses less digits than its factorization.

561543331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682.

The product of its digits is 16200, while the sum is 31.

The square root of 561543331 is about 23696.9055152777. The cubic root of 561543331 is about 825.0135686780.

Adding to 561543331 its reverse (133345165), we get a palindrome (694888496).

The spelling of 561543331 in words is "five hundred sixty-one million, five hundred forty-three thousand, three hundred thirty-one".