561099 has 24 divisors (see below), whose sum is σ = 952128. Its totient is φ = 290640.

The previous prime is 561097. The next prime is 561101. The reversal of 561099 is 990165.

It is an interprime number because it is at equal distance from previous prime (561097) and next prime (561101).

It is not a de Polignac number, because 561099 - 2¹ = 561097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1444 + ... + 1790.

It is an arithmetic number, because the mean of its divisors is an integer number (39672).

2⁵⁶¹⁰⁹⁹ is an apocalyptic number.

561099 is a deficient number, since it is larger than the sum of its proper divisors (391029).

561099 is a wasteful number, since it uses less digits than its factorization.

561099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 561099 is about 749.0654177040. The cubic root of 561099 is about 82.4795909112.

The spelling of 561099 in words is "five hundred sixty-one thousand, ninety-nine".