561133421 has 8 divisors (see below), whose sum is σ = 577745784. Its totient is φ = 544660480.

The previous prime is 561133357. The next prime is 561133427. The reversal of 561133421 is 124331165.

It can be written as a sum of positive squares in 4 ways, for example, as 114276100 + 446857321 = 10690^2 + 21139^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561133421 - 2⁶ = 561133357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561133427) 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, 26660 + ... + 42813.

It is an arithmetic number, because the mean of its divisors is an integer number (72218223).

Almost surely, 2^561133421 is an apocalyptic number.

It is an amenable number.

561133421 is a deficient number, since it is larger than the sum of its proper divisors (16612363).

561133421 is a wasteful number, since it uses less digits than its factorization.

561133421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69711.

The product of its digits is 2160, while the sum is 26.

The square root of 561133421 is about 23688.2549167304. The cubic root of 561133421 is about 824.8127746554.

Adding to 561133421 its reverse (124331165), we get a palindrome (685464586).

The spelling of 561133421 in words is "five hundred sixty-one million, one hundred thirty-three thousand, four hundred twenty-one".