561921523 has 8 divisors (see below), whose sum is σ = 605923920. Its totient is φ = 519361920.

The previous prime is 561921517. The next prime is 561921557. The reversal of 561921523 is 325129165.

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-561921523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561921323) 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, 359890 + ... + 361447.

It is an arithmetic number, because the mean of its divisors is an integer number (75740490).

Almost surely, 2^561921523 is an apocalyptic number.

561921523 is a deficient number, since it is larger than the sum of its proper divisors (44002397).

561921523 is a wasteful number, since it uses less digits than its factorization.

561921523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721397.

The product of its digits is 16200, while the sum is 34.

The square root of 561921523 is about 23704.8839482500. The cubic root of 561921523 is about 825.1987390201.

The spelling of 561921523 in words is "five hundred sixty-one million, nine hundred twenty-one thousand, five hundred twenty-three".