561161321 has 8 divisors (see below), whose sum is σ = 647211840. Its totient is φ = 476581968.

The previous prime is 561161303. The next prime is 561161323. The reversal of 561161321 is 123161165.

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 561161321 - 2¹⁴ = 561144937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561161323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366971 + ... + 368496.

It is an arithmetic number, because the mean of its divisors is an integer number (80901480).

Almost surely, 2^561161321 is an apocalyptic number.

It is an amenable number.

561161321 is a deficient number, since it is larger than the sum of its proper divisors (86050519).

561161321 is a wasteful number, since it uses less digits than its factorization.

561161321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735583.

The product of its digits is 1080, while the sum is 26.

The square root of 561161321 is about 23688.8438088481. The cubic root of 561161321 is about 824.8264445446.

The spelling of 561161321 in words is "five hundred sixty-one million, one hundred sixty-one thousand, three hundred twenty-one".