561345023 has 8 divisors (see below), whose sum is σ = 563970192. Its totient is φ = 558726336.

The previous prime is 561345011. The next prime is 561345041. The reversal of 561345023 is 320543165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561345023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561345073) 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 7 ways as a sum of consecutive naturals, for example, 261611 + ... + 263747.

It is an arithmetic number, because the mean of its divisors is an integer number (70496274).

Almost surely, 2^561345023 is an apocalyptic number.

561345023 is a deficient number, since it is larger than the sum of its proper divisors (2625169).

561345023 is a wasteful number, since it uses less digits than its factorization.

561345023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 561345023 is about 23692.7208863820. The cubic root of 561345023 is about 824.9164398993.

Adding to 561345023 its reverse (320543165), we get a palindrome (881888188).

The spelling of 561345023 in words is "five hundred sixty-one million, three hundred forty-five thousand, twenty-three".