561615 has 8 divisors (see below), whose sum is σ = 898608. Its totient is φ = 299520.

The previous prime is 561607. The next prime is 561667. The reversal of 561615 is 516165.

561615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 561615 - 2³ = 561607 is a prime.

It is a super-2 number, since 2×561615² = 630822816450, which contains 22 as substring.

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, 18706 + ... + 18735.

It is an arithmetic number, because the mean of its divisors is an integer number (112326).

2⁵⁶¹⁶¹⁵ is an apocalyptic number.

561615 is a deficient number, since it is larger than the sum of its proper divisors (336993).

561615 is a wasteful number, since it uses less digits than its factorization.

561615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37449.

The product of its digits is 900, while the sum is 24.

The square root of 561615 is about 749.4097677506. The cubic root of 561615 is about 82.5048665632.

It can be divided in two parts, 561 and 615, that added together give a triangular number (1176 = T₄₈).

The spelling of 561615 in words is "five hundred sixty-one thousand, six hundred fifteen".