561215 has 8 divisors (see below), whose sum is σ = 680400. Its totient is φ = 444352.

The previous prime is 561199. The next prime is 561229. The reversal of 561215 is 512165.

561215 = 122² + 123² + ... + 151².

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 561215 - 2⁴ = 561199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 1059.

It is an arithmetic number, because the mean of its divisors is an integer number (85050).

2⁵⁶¹²¹⁵ is an apocalyptic number.

561215 is a deficient number, since it is larger than the sum of its proper divisors (119185).

561215 is a wasteful number, since it uses less digits than its factorization.

561215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 300, while the sum is 20.

The square root of 561215 is about 749.1428435218. The cubic root of 561215 is about 82.4852743843.

The spelling of 561215 in words is "five hundred sixty-one thousand, two hundred fifteen".